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Changes to the Periodic Table - Periodic Table of Videos

Video vocabulary

mug

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US / mʌɡ /

UK / mʌɡ /

B1
  • noun
  • Large ceramic drinking cup with a handle
  • verb
  • To attack someone to rob them

over

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US / 'əʊvə(r) /

UK / ˈovɚ /

A1
  • adverb
  • Finished; no longer happening
  • Towards the ground/away from a standing position
  • noun
  • A set of six consecutive balls bowled in cricket
  • other
  • Finished
  • preposition
  • Showing the relation when a thing is above another
  • On or covering something
  • Above or across something
  • More than you need
  • From one side to the other
  • In the direction of; toward

office

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US / ˈɒfɪs /

UK / ˈɔ:fɪs /

A1
  • noun
  • Room or building used for business
  • Important job position, often in a government

decide

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US / dɪ'saɪd /

UK / dɪˈsaɪd /

A2
  • verb
  • To make a choice or choose after thinking about it
  • To make a legal judgment in court
  • to affect the result of something

composition

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US / ˌkɒmpəˈzɪʃn /

UK / ˌkɑ:mpəˈzɪʃn /

A2
  • noun
  • Piece of writing, music etc.
  • A piece of music
  • Structure of a picture or image to make an effect

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

sulphate

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US / ˈsʌlfeɪt /

UK / ˈsʌlfeɪt /

C1
  • noun
  • Salt or ester of sulphuric acid

out

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US / aʊt /

UK / aʊt /

A1
  • adverb
  • No longer stylish (e.g. fashion)
  • Away from home, business, or the usual place
  • In a direction/movement away from inside or center
  • noun
  • Act when a batter cannot continue playing
  • verb
  • To tell people a secret

adopt

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US / əˈdɒpt /

UK / əˈdɑ:pt /

A2
  • verb
  • To legally take a child into your family
  • To take on responsibility for something

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

react

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US / rɪ'ækt /

UK / riˈækt /

A2
  • verb
  • To change when mixing with other chemicals
  • To behave or make a change in a particular way

crystal

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US / 'krɪstl /

UK / ˈkrɪstəl /

B1
  • noun
  • A solid formed by the solidification of a chemical
  • Rock with regularly repeating internal structure
  • Person's name

something

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US / ˈsʌmθɪŋ /

UK / ˈsʌmθɪŋ /

A1
  • adverb
  • In some degree or measure
  • noun
  • a person or thing of some value or consequence
  • pronoun
  • Thing that is not yet known or named
  • Approximately

affect

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US / ə'fekt /

UK / əˈfɛkt /

A2
  • verb
  • To cause a change in something else

name

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US / neɪm /

UK / nem /

A1
  • noun
  • What something or someone is called
  • verb
  • To state what someone is called, e.g. John

isotope

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US / ˈaɪsətəʊp /

UK / ˈaɪsətoʊp /

A1
  • noun
  • Chemical element nearly identical, but with differing weights

chemistry

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US / 'kemɪstrɪ /

UK / ˈkɛmɪstri /

B1
  • noun
  • The study of the structure of substances

keep

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US / ki:p /

UK / kip /

A1
  • noun
  • Large, strong tower in the middle of a castle
  • Money spent on you so you can live in a place
  • verb
  • To continue doing something; not to stop
  • To stop balls going in a goal in sports
  • To not give back or return something
  • (Of food) to not spoil or not rot
  • To take possession of something to own, e.g. a pet
  • To have and continue to hold something
  • To do something that you have promised or agreed
  • To stay in a certain place or condition
  • To maintain the rules

another

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US / əˈnʌðə(r) /

UK / əˈnʌðɚ /

A1
  • adjecitve
  • One more, but not this
  • determiner
  • One more added
  • pronoun
  • One more (thing)

where

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US / hwɛə /

UK / hwɛr, wɛr /

A1
  • conjunction
  • At or in the place which
  • In whatever place
  • pronoun
  • Word you use to ask the location of something

snag

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US / snæɡ /

UK / snæɡ /

B2
  • noun
  • Unforeseen difficulty, an obstacle
  • verb
  • To catch something on something sharp
  • To break or hinder progress

most

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US / məʊst /

UK / most /

A1
  • adverb
  • Very; extremely
  • Greatest possible degree
  • pronoun
  • Nearly all of something

volcano

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US / vɒlˈkeɪnəʊ /

UK / vɑ:lˈkeɪnoʊ /

B1
  • noun
  • Mountain through which hot liquid earth can erupt

two

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US / tu: /

UK / tu /

A1
  • number
  • 2

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

range

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US / reɪndʒ /

UK / rendʒ /

A2
  • noun
  • Cooking stove with multiple burners
  • Given distance from a point; how far plane can fly
  • Large grassy area where cattle wander and feed
  • Group or chain of mountains
  • Set of things with something in common
  • Limits within which something extends or varies
  • A set of products, e.g. so that people can choose
  • verb
  • To cover an area from one point to another
  • To extend to or vary within given limits
  • To put things in a row or in line
  • To wander or explore

why

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US / waɪ /

UK / hwaɪ, waɪ /

A1
  • adverb
  • Question word to ask for a reason
  • exclamation
  • (Used to express surprise or approval)

difference

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US / 'dɪfrəns /

UK / ˈdɪfərəns, ˈdɪfrəns /

A1
  • noun
  • A thing or issue that people do not agree about
  • Not of the same kind; unlike other things

much

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US / mʌtʃ /

UK / mʌtʃ /

A1
  • adjecitve
  • Very; to a high level or degree
  • adverb
  • A lot; large amount; a high degree of
  • Nearly; basically
  • On many occasions; often
  • noun
  • A large amount; a great quantity

anyway

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US / ˈeniweɪ /

UK / ˈɛniˌwe /

A1
  • adverb
  • A word used to change the topic of a conversation

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

somewhere

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US / 'sʌmweə(r) /

UK / ˈsʌmˌhwɛr, -ˌwɛr /

A1
  • adverb
  • At or to an unknown or unnamed place

acceptable

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US / əkˈseptəbl /

UK / ækˈsɛptəbəl /

A2
  • adjecitve
  • Satisfactory; good enough

molecule

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US / ˈmɒlɪkju:l /

UK / ˈmɑlɪˌkjul /

B2
  • noun
  • Two or more atoms chemically combined

amount

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US / ə'maʊnt /

UK / əˈmaʊnt /

A1
  • noun
  • Quantity of something
  • verb
  • To add up to a certain figure

question

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US / 'kwestʃən /

UK / ˈkwɛstʃən /

A1
  • noun
  • Issue or problems you are dealing with
  • What you ask about; issue
  • verb
  • To ask for or try to get information
  • To have or express concerns or uncertainty

adjustment

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US / əˈdʒʌstmənt /

UK / əˈdʒʌstmənt /

A2
  • noun
  • Small change to attain a desired state or function
  • A change to make something function better

fact

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US / fækt /

UK / fækt /

A1
  • noun
  • Something that is known or proved to be true

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

atomic

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US / əˈtɒmɪk /

UK / əˈtɑ:mɪk /

B1
  • adjecitve
  • Concerning atoms

individual

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US / ˌɪndɪˈvɪdʒuəl /

UK / ˌɪndəˈvɪdʒuəl /

A2
  • adjecitve
  • Made for use by one single person
  • Having a distinct manner different from others
  • noun
  • Single person, looked at separately from others

earth

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US / ɜ:θ /

UK / ɚθ /

A1
  • noun
  • Wire connecting an electrical device to the ground
  • The planet we live on
  • Soil in which we grow plants

under

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US / ˈʌndə(r) /

UK / ˈʌndɚ /

A1
  • adjecitve
  • In the same place as another thing, but lower
  • adverb
  • In a lower quantity or price than expected
  • preposition
  • According to the terms of an agreement or law
  • Managed or controlled by the authority of
  • Being of a lesser quality or amount than expected
  • Influenced or affected by something or someone
  • Less or lower in age, amount, size or number

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

wind

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US / wɪnd /

UK / wɪnd /

A1
  • adjecitve
  • (Musical instruments) that you blow into to play
  • noun
  • A current of air moving approximately horizontally, especially one strong enough to be felt
  • Something that has influence
  • verb
  • If a road, path, or river winds, it follows a route that turns repeatedly in different directions
  • To turn or cause something to turn
  • To twist around something

overall

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US / ˌəʊvər'ɔ:l /

UK / ˈovɚˌrɔl /

A2
  • adjecitve
  • Viewed as a whole; in general, not as details

mass

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US / mæs /

UK / mæs /

B1
  • noun
  • Religious ceremony in some Christian churches
  • Large amount or number of something
  • Main or largest part of something
  • Large number of people considered as a whole
  • Amount of matter that an object has
  • verb
  • To gather people or things into a large group

one

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US / wʌn /

UK / wʌn /

A1
  • pronoun
  • You; we; people in general; someone
  • The thing or person previously referred to
  • adjecitve
  • Used to refer to people generally
  • Being a strong example of (something mentioned)
  • number
  • Number 1

how

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US / haʊ /

UK / haʊ /

A1
  • adjecitve
  • To what degree? in what amount?
  • adverb
  • (Used to explain the way to do something)
  • exclamation
  • For what purpose or reason?
  • (Used to ask someone or something's condition)

universe

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US / ˈju:nɪvɜ:s /

UK / ˈjunəˌvɚs /

B2
  • noun
  • All of space that contains planets and stars
  • Things surrounding a person, affecting their life

message

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US / 'mesɪdʒ /

UK / ˈmɛsɪdʒ /

A2
  • noun
  • Main idea or theme in a story, book, or film
  • Piece of information that is told/given to someone
  • verb
  • To communicate using text

wall

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US / wɔ:l /

UK / wɔl /

A1
  • noun
  • High, flat side of a room or building

live

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US / lɪv /

UK / liv /

A1
  • adjecitve
  • Being broadcast as events happen, not recorded
  • Carrying electric current; able to give a shock
  • Glowing because burning; hot
  • Not yet killed (for food)
  • adverb
  • (Music, drama) as it is performed
  • verb
  • To be alive
  • To experience a particular type of life
  • To make your home in a house or town

fit

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US / fɪt /

UK / fɪt /

A2
  • adjecitve
  • Good looking; physically attractive
  • Proper or acceptable; morally or socially correct
  • noun
  • Sudden loss of body control; attack (of crying)
  • verb
  • To install a machine, equipment etc.
  • To adjust or change to the right size or shape
  • To be the right size and shape that you want

chemist

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US / ˈkemɪst /

UK / ˈkɛmɪst /

B1
  • noun
  • Person who sells medicines; drug store
  • Person who studies or does research in chemistry

make

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US / meɪk /

UK / mek /

A1
  • noun
  • Product made by a particular company; brand
  • verb
  • To arrange or prepare something e.g. dinner
  • To get to (a place) on time
  • To gain the status of (teacher, lawyer, etc.)
  • To create something by putting things together
  • To earn a certain amount of money at a job
  • To cause or force a person to do something
  • To cause something to happen or be formed

than

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US / ðən /

UK / ðən /

A1
  • conjunction
  • Used to compare two things that are not equal

year

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US / jə: /

UK / jɪr /

A1
  • noun
  • Unit of time equal to 12 months or 365 or 366 days
  • Used to refer to the age of a person

average

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US / 'ævərɪdʒ /

UK / ˈævərɪdʒ, ˈævrɪdʒ /

A2
  • adjecitve
  • Typical or normal; usual; ordinary
  • noun
  • Total of numbers divided by the number of items
  • verb
  • To add numbers then divide by the number of items

answer

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US / 'ɑ:nsə(r) /

UK / ˈænsɚ /

A1
  • noun
  • Reply to a question someone asks
  • Solution to a problem or test question
  • verb
  • To reply to a question someone asks
  • To solve a test question or a problem

the

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US / ðə /

UK / ðə /

A1
  • article
  • Used to refer to something already mentioned
  • Used to show there is only one of something
  • determiner
  • Used to describe all of a family

chemically

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US / 'kemɪklɪ /

UK / 'kemɪklɪ /

B1
  • adverb
  • By means of a chemical process

rock

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US / rɒk /

UK / rɑk /

A1
  • noun
  • Type of popular music with a strong, loud beat
  • Strong, tough person who can be relied upon
  • Big stone; hard, solid substance forming mountains
  • verb
  • To be greatly upset by something, e.g. a death
  • To be extremely effective or pleasing
  • To play, sing along with, or dance to heavy music
  • To move back and forth or from side to side

rate

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US / reɪt /

UK / ret /

A1
  • noun
  • Current price or cost of something
  • Speed or frequency of events over time
  • verb
  • To assess something or consider its qualities

strength

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US / streŋθ /

UK / strɛŋkθ, strɛŋθ, strɛnθ /

A2
  • noun
  • Condition of being strong

natural

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US / ˈnætʃərəl /

UK / ˈnætʃərəl, ˈnætʃrəl /

A1
  • adjecitve
  • Being as one would expect; being usual or normal
  • Not made by humans; without human intervention

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

therefore

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US / ˈðeəfɔ:(r) /

UK / ˈðerfɔ:(r) /

A1
  • adverb
  • And so; for that reason

chemical

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US / ˈkemɪkl /

UK / ˈkɛmɪkəl /

A2
  • adjecitve
  • Made of various elements
  • noun
  • Basic substance produced by mixing elements

you

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US / jʊ /

UK / ju /

A1
  • pronoun
  • Person someone is speaking or writing to
  • Person or people in general

pure

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US / pjʊə(r) /

UK / pjʊr /

A2
  • adjecitve
  • Not mixed with anything else
  • Being morally good

england

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US / 'ɪŋɡlənd /

UK / ˈɪŋɡlənd /

A1
  • proper noun
  • A European country that forms the largest and most southern part of Great Britain and of the United

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

sulfide

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US / 'sʌlfaɪd /

UK / ˈsʌlˌfaɪd /

A1
  • other
  • A compound of sulphur and some other element that is more electropositive

isotopic

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US / ˌaɪsəˈtɒpɪk /

UK / aɪsoʊˈtɑːpɪk /

A1
  • adjecitve
  • Concerning or having the relation of an isotope

world

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US / wɜ:ld /

UK / wɜrld /

A1
  • noun
  • All the humans, events, activities on the earth
  • Political division due to some kind of similarity

sample

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US / ˈsɑ:mpl /

UK / ˈsæmpl /

A2
  • noun
  • A small quantity of something used as a taster
  • verb
  • To try (e.g. food, drink), to see if you like it

away

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US / ə'weɪ /

UK / əˈwe /

A1
  • adjecitve
  • Not present
  • adverb
  • Disappear completely
  • Doing something with a lot of energy
  • Not here; far from here; in a different direction
  • To a different area, location

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

ratio

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US / ˈreɪʃiəʊ /

UK / ˈreɪʃioʊ /

C2
  • noun
  • The relationship in relative size, etc.

careful

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US / ˈkeəfl /

UK / ˈkerfl /

A2
  • adjecitve
  • Trying not to make mistakes; working slowly

shroud

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US / ʃraʊd /

UK / ʃraʊd /

C1
  • noun
  • Cover for a dead body
  • verb
  • To hide, as with secrecy; make it difficult to see

scientist

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US / ˈsaɪəntɪst /

UK / ˈsaɪəntɪst /

A2
  • noun
  • Person who is trained in a science

accurately

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US / 'ækjərətlɪ /

UK / 'ækjərətlɪ /

A2
  • adverb
  • Exactly and without any mistakes; correctly

see

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US / si: /

UK / si /

A1
  • verb
  • To go on a date with someone
  • To predict whether something is, or will be true
  • To understand what someone says
  • To use your eyes to look at something
  • To visit a place often for sightseeing or pleasure
  • To visit or meet with someone
  • To find out by waiting or looking
  • To watch (a game, movie or TV show)

tea

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US / ti: /

UK / ti /

A1
  • noun
  • A full meal eaten around 5-7 p.m (in the UK)
  • Drink made when you put dried leaves in hot water
  • Snack with a hot drink and cake, in the afternoon

slightly

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US / ˈslaɪtli /

UK / ˈslaɪtli /

B1
  • adverb
  • Only a little

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

value

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US / 'vælju: /

UK / ˈvælju /

A1
  • noun
  • Importance you attach to something
  • Some information expressed as a number
  • Stated price of something; worth
  • verb
  • To place a high importance on something
  • To say how much money something is worth

tell

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US / tel /

UK / tɛl /

A1
  • verb
  • To (strongly) advise a person to do something
  • To be able to guess
  • To say or communicate information to someone
  • To inform, but without speaking; indicate
  • To have a negative effect on someone
  • To order someone to do something; command
  • To recognize something based on certain signs
  • To report something to an authority
  • To explain something or teach someone something

people

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US / 'pi:pl /

UK / ˈpipəl /

A1
  • noun
  • Persons sharing culture, country, background, etc.
  • Men, Women, Children

suddenly

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US / ˈsʌdənli /

UK / ˈsʌdn:lɪ /

A1
  • adverb
  • In an unexpected or very quick manner

then

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US / ðen /

UK / ðɛn /

A1
  • adverb
  • A time that is not now
  • Following another thing in time or arrangement
  • Following on reasonably from what was just stated
  • At that time, not now

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’

nothing

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US / 'nʌθɪŋ /

UK / ˈnʌθɪŋ /

A1
  • noun
  • Item of little or no value, importance, interest
  • Number or value of zero
  • pronoun
  • Not anything, not a single thing

example

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US / ɪgˈzɑ:mpl /

UK / ɪɡˈzæmpəl /

A1
  • noun
  • Thing, person which represents a category

number

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US / ˈnʌmbə(r) /

UK / ˈnʌmbɚ /

A1
  • noun
  • Symbols such as 1, 2, 56, 793
  • Particular song or dance performed during a show
  • Total quantity or amount of things
  • verb
  • To put numbers on things
  • To assign a sequence within a group, series, set
  • To claim to be part of a larger group, series, set

reaction

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US / rɪ'ækʃn /

UK / riˈækʃən /

A2
  • noun
  • Bodily response to a drug or something eaten
  • Feeling or action in response to something

everywhere

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US / ˈevriweə(r) /

UK / ˈevriwer /

A1
  • adverb
  • Every place

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

again

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US / ə'ɡen /

UK / əˈɡɛn /

A1
  • adverb
  • One more time, once more

bother

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US / 'bɒðə(r) /

UK / ˈbɑðɚ /

A2
  • noun
  • Problems, concern or worry for someone
  • A disturbance; trouble
  • verb
  • To cause problems, concerns or worry for someone
  • To take the trouble to do something

hydrogen

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US / ˈhaɪdrədʒən /

UK / ˈhaɪdrədʒən /

B1
  • noun
  • Lightest of all chemical elements

place

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US / pleɪs /

UK / ples /

A1
  • noun
  • Particular location, area or region
  • verb
  • To put someone in a particular type of situation
  • To put something in a certain location or position

element

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US / 'elɪmənt /

UK / ˈɛləmənt /

A2
  • noun
  • Essential or particular part of something

interesting

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US / ˈɪntrəstɪŋ /

UK / ˈɪntrɪstɪŋ, -tərɪstɪŋ, -təˌrɛstɪŋ /

A1
  • adjecitve
  • Taking your attention; making you want to know
  • verb
  • To make someone want to know about something
  • To persuade to do, become involved with something

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

A1
  • adjecitve
  • Not of the same kind; unlike other things

boron

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US / ˈbɔːrɒn /

UK / ˈbɔːrɑːn /

A1
  • noun
  • Metalloid element used in nuclear and other plants

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said

fun

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US / fʌn /

UK / fʌn /

A1
  • adjecitve
  • Amusing and enjoyable
  • noun
  • Enjoyable or amusing quality or feeling

publish

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US / 'pʌblɪʃ /

UK / ˈpʌblɪʃ /

A2
  • verb
  • To prepare and make available a book magazine etc.
  • To release information to the general public

age

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US / eɪdʒ /

UK / edʒ /

A1
  • verb
  • To keep food, wine for a long time to improve it
  • To get older
  • noun
  • Period of time in history
  • Number of years a person or thing has lived

matter

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US / 'mætə(r) /

UK / ˈmætɚ /

A1
  • noun
  • Material all things are made of that fills space
  • Problem or reason for concern
  • verb
  • To be of great importance; to count

radioactive

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US / ˌreɪdɪəʊ'æktɪv /

UK / ˌredioˈæktɪv /

B2
  • adjecitve
  • Emitting harmful energy from nuclear activity

new

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US / nju: /

UK / nu, nju /

A1
  • adjecitve
  • Not old, recently born, built or made
  • Being or doing something for the first time
  • Not felt, seen or known previously
  • Having been recently bought or obtained

geological

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US / ˌdʒi:ə'lɒdʒɪkl /

UK / dʒɪəˈlɑdʒɪkl: /

B1
  • adjecitve
  • Concerning studies of the Earth's rocks and soil

minor

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US / 'maɪnə(r) /

UK / ˈmaɪnɚ /

B1
  • adjecitve
  • Not so large in size; not important or valuable
  • An interval a half tone smaller than its major
  • noun
  • Subject studied in college, but not the main one
  • Someone too young to be legally responsible

probably

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US / ˈprɒbəbli /

UK / ˈprɑbəbli /

A1
  • adverb
  • That is likely to happen or be true

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

blend

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US / blend /

UK / blɛnd /

B1
  • noun
  • Product known for mixing ingredients
  • verb
  • To combine different elements or substances
  • To mix ingredients when cooking
  • To mix things in an effective or pleasing way

series

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US / ˈsɪəri:z /

UK / ˈsɪriz /

A1
  • noun
  • Set of stories or articles on a particular subject
  • other
  • Number of things that happen one after another

small

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US / smɔ:l /

UK / smɔl /

A1
  • adjecitve
  • Little in size; not big
  • (Of letters) not written in capital letters
  • Being insignificant or minor
  • (Of a business) with few people or things; local
  • (Of voice) being soft and quiet
  • (Of a child) being young

should

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US / ʃʊd /

UK / ʃʊd /

A1
  • other
  • Used to indicate what is proper or reasonable

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

A1
  • adverb
  • Used to add new (often different) information

use

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US / ju:s /

UK / ju:s /

A1
  • noun
  • Ability to employ something
  • Need to enable it to work
  • Permission to do something with something
  • Act of spending money
  • Operation of a machine for its function
  • verb
  • To have; to eat, drink, consume etc.
  • To need to operate or work
  • To operate a machine, e.g. a computer
  • To treat a person badly
  • To do something with, for a task or purpose

union

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US / 'ju:nɪən /

UK / ˈjunjən /

A2
  • noun
  • Act of joining two or more things into one
  • Marriage
  • Organization of workers to look after their needs

try

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US / traɪ /

UK / traɪ /

A1
  • noun
  • Act of putting the ball over the rugby goal line
  • verb
  • To make an effort, to attempt to do something
  • To examine someone or something in a court of law
  • To test to see if it is good or you like it
  • To make a person go through hardship; test
  • To examine something to see if it works

worried

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US / ˈwʌrid /

UK / ˈwɜ:rid /

A1
  • adjecitve
  • Feeling troubled or concerned
  • verb
  • To cause concern or trouble over something
  • To feel concerned or troubled about something

million

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US / ˈmɪljən /

UK / ˈmɪljən /

A1
  • number
  • 1,000,000

story

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US / 'stɔ:rɪ /

UK / ˈstɔri, ˈstori /

A1
  • noun
  • One of many floors or levels in a building
  • Account or description of how something happened

sulphur

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US / 'sʌlfə(r) /

UK / ˈsʌlfɚ /

C2
  • noun
  • Smelly yellow chemical often found near volcanoes

carbon

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US / 'kɑ:bən /

UK / ˈkɑrbən /

B1
  • noun
  • Chemical element with an atomic number of 6

bond

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US / bɒnd /

UK / bɑnd /

A2
  • noun
  • Rope, chain or other thing used to tie someone up
  • Closeness that is shared between people or groups
  • Loan that a government must buy back by a set date
  • Written agreement to pay back borrowed money
  • Joint or connection, often using glue
  • verb
  • To develop a close relationship with
  • To become joined or connected, e.g. using glue

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

geology

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US / dʒɪ'ɒlədʒɪ /

UK / dʒiˈɑlədʒi /

B1
  • noun
  • Study of the Earth's rocks, soil etc.

sort

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US / sɔ:t /

UK / sɔrt /

A1
  • noun
  • Group or class of similar things or people
  • verb
  • To organize things by putting them into groups
  • To deal with things in an organized way

all

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US / ɔ:l /

UK / ɔl /

A1
  • adverb
  • Completely; totally
  • determiner
  • Being every one of something
  • pronoun
  • 100% of something; the complete amount

viewer

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US / ˈvju:ə(r) /

UK / ˈvjuɚ /

A2
  • noun
  • Special machine to look at pictures
  • Someone who watches, e.g. television

paper

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US / ˈpeɪpə(r) /

UK / ˈpeɪpər /

A1
  • adjecitve
  • Not existing in reality, or done infrequently
  • Made from the material that we use to make books
  • noun
  • Academic writing or a talk on a specific topic
  • Written test
  • Newspaper
  • Pages of a book are made from this

produce

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US / prə'dju:s /

UK / prəˈdus, -ˈdjus, pro- /

A1
  • noun
  • Fresh foods such as fruits and vegetables
  • verb
  • To grow something naturally
  • To make something appear
  • To manufacture something using machines
  • To control the making a movie or television show

work

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US / wɜ:k /

UK / wɚk /

A1
  • adjecitve
  • Activity completed in order to make money
  • noun
  • The product of some artistic or literary endeavor
  • Everything created by an author, artist, musician
  • Activity you do in order to make money
  • Place of employment
  • Final product or result of a some labor or effort
  • verb
  • To bring into a specific state of success
  • To be functioning properly, e.g. a car
  • To do your job in your company or workplace
  • To make an effort to do something
  • To operate a machine or device

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

result

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US / rɪ'zʌlt /

UK / rɪˈzʌlt /

A2
  • noun
  • Something produced through tests or experiments
  • Final score of a competition, election or game
  • verb
  • To be the outcome of other causes and effects

throw

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US / θrəʊ /

UK / θroʊ /

A1
  • noun
  • Arm movement to make a thing fly through the air
  • Loose cloth or blanket (usually over a chair)
  • Forcibly putting someone on the ground
  • verb
  • To use your arm to make something fly in the air
  • To move part of your body suddenly and forcefully
  • To confuse or upset someone
  • (E.g. judo) to forcibly put someone on the ground
  • To put something somewhere suddenly and roughly

their

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US / ðɛː /

UK / ðer /

A1
  • determiner
  • Belonging to them

atom

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US / 'ætəm /

UK / ˈætəm /

B1
  • noun
  • Smallest bit that matter can be broken down into

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

nice

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US / naɪs /

UK / naɪs /

A1
  • adjecitve
  • Being attractive or of high quality or value
  • Good or enjoyable
  • Being kind or friendly

very

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US / 'verɪ /

UK / ˈvɛri /

A1
  • adjecitve
  • Concerning a large degree or amount
  • adverb
  • A lot; much; many
  • Used to stress or emphasize a noun

deuterium

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US / dju:ˈtɪəriəm /

UK / duˈtɪriəm, dju- /

A1
  • noun
  • Isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)

spectrometer

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US / spekˈtrɒmɪtə(r) /

UK / spekˈtrɑ:mɪtə(r) /

C1
  • noun
  • Spectroscope for obtaining a mass spectrum

who

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US / hu: /

UK / hu /

A1
  • pronoun
  • Which person
  • Used to introduce information about people

enormously

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US / ɪˈnɔ:məsli /

UK / ɪˈnɔ:rməsli /

B1
  • adverb
  • Extremely (happy, popular, etc.)

table

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US / ˈteɪbl /

UK / ˈtebəl /

A1
  • noun
  • Diagram that shows data in rows and columns
  • Raised flat surface you sit at to work or eat
  • verb
  • To leave an idea to be discussed at a later date

give

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US / ɡɪv /

UK / ɡɪv /

A1
  • noun
  • Degree of flexibility in something, a material
  • verb
  • To hand over or present something to someone
  • To cause someone to have or experience something

sulfur

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US / 'sʌlfə /

UK / ˈsʌlfɚ /

C2
  • noun
  • Smelly yellow chemical often found near volcanoes

periodic

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US / ˌpɪəriˈɒdɪk /

UK / ˌpɪriˈɑ:dɪk /

A2
  • adjecitve
  • Happening regularly, but not frequently

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

want

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US / wɔnt /

UK / wɑnt, wɔnt /

A1
  • noun
  • Something you desire or wish for
  • State or condition of poverty
  • verb
  • To desire or wish for something; hope for a thing

study

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US / 'stʌdɪ /

UK / ˈstʌdi /

A1
  • noun
  • Room that a person studies or reads in
  • Piece of research
  • Topic or subject you research or learn about
  • verb
  • To focus on learning something usually at school

whether

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US / ˈweðə(r) /

UK / ˈhwɛðɚ, ˈwɛð- /

A1
  • conjunction
  • If something will happen or not

understand

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US / ˌʌndə'stænd /

UK / ˌʌndɚˈstænd /

A1
  • verb
  • To know the meaning of language, what someone says

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

survey

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US / 'sɜ:veɪ /

UK / ˈsɜː(r)veɪ /

A2
  • noun
  • Broad view or general description of something
  • Act of measuring land or property to make a map
  • Set of questions used to ask people about a topic
  • verb
  • To offer a broad view or general description
  • To measure an area of land to make a map of it
  • To ask people a question about a particular topic

weight

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US / weɪt /

UK / wet /

A2
  • noun
  • How heavy something is
  • Metal object to measure how heavy something is
  • Importance, power, and influence person, thing has
  • A source of worry, sadness, or emotional stress

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

fix

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US / fɪks /

UK / fɪks /

A2
  • noun
  • Answer to a problem
  • verb
  • To arrange or prepare something
  • To attach something so it will not move or change
  • To dishonestly arrange the result of a game
  • To make an animal unable to produce young
  • To make something whole or able to work again

measure

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US / ˈmeʒə(r) /

UK / ˈmɛʒɚ /

A1
  • noun
  • Plan to achieve a desired result
  • Tool used to calculate the size of something
  • verb
  • To determine the value or importance of something
  • To calculate size, weight or temperature of

but

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US / bət /

UK / bʌt,bət /

A1
  • conjunction
  • Used before you say something different, opposite

life

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US / laɪf /

UK / laɪf /

A1
  • noun
  • All the living things e.g. animals, plants, humans
  • Period of time things live, from birth to death

apply

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US / ə'plaɪ /

UK / əˈplaɪ /

A1
  • verb
  • To spread a substance or liquid over a surface
  • To commit your time and effort to doing something
  • To make something useful in a certain situation
  • To be relevant for a situation
  • To ask formally for (job, permission etc.)

whole

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US / həul /

UK / hol /

A1
  • adjecitve
  • Complete or full; all of
  • Being in a good condition
  • noun
  • Complete amount or sum; total

mine

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US / maɪn /

UK / maɪn /

A1
  • noun
  • A bomb hidden in the ground or the sea
  • Rich source of material or information
  • Place under the ground where coal, etc. is dug out
  • pronoun
  • That thing that belongs to me
  • verb
  • To place a bomb in the ground or the sea
  • To dig into the earth or sea to obtain minerals

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

now

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US / naʊ /

UK / naʊ /

A1
  • adverb
  • At the present time or moment
  • Right away or in the next possible moment
  • Used to refer to something that just happened
  • Time between the present and a moment in the past
  • conjunction
  • Resulting from or because of something

really

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US / ˈri:əli /

UK / ˈriəˌli, ˈrili /

A1
  • adverb
  • Used to stress something that is said; definitely
  • In a true or accurate manner
  • Very
  • Subtitles section
  • We've had some messages from viewers.
  • They're worried.
  • Why is the periodic table changing again?
  • Most people can understand when you get an element with a new name, like Copernicium this year.
  • But these numbers, which have been here for ages, under the different elements, the so-called atomic weight, how can that change?
  • And suddenly, they read a new story.
  • See, IUPAC, International Union of Pure and Applied Chemistry, has changed them.
  • It's nothing sacred.
  • Why can they change these things?
  • Well, the answer is, they haven't really changed them.
  • But what these numbers are, are the so-called atomic weights, which are the weights of the average weight of the different isotopes of the elements.
  • Isotopes are atoms that have different weights.
  • Most elements have more than one sort of atom, which are chemically the same.
  • We've told you about hydrogen and deuterium.
  • These are just the same.
  • Lots of elements have more than one isotope.
  • Carbon has two.
  • Carbon-12, Carbon-13.
  • And a radioactive one, Carbon-14, the one that was used to date the Turin Shroud.
  • So, what have they changed?
  • What they've changed are these weights, which refer to the average of the weights of the different isotopes of the elements.
  • What IUPAC has recognised is the fact that different samples of elements from different places around the world, whether it's sulphur from a volcano, or sulphate from a mine somewhere in England, have slightly different isotopic compositions,
  • And therefore, they have slightly different atomic weights.
  • Up till now, all scientists have been trying to fit the same atomic weight to sulphur from everywhere, and they've gone to all sorts of snags.
  • Now what has been decided is there's a range of values.
  • Sulphur on the Earth can have an average weight from this amount to that one.
  • For example, here with boron, instead of being 10.811, it can be from 10.806 to 10.821.
  • And they've changed the things for 10 elements.
  • This is just a minor adjustment, and it'll make it so much easier for chemists to work.
  • I've no idea why they've done it now.
  • I think it's probably because there's been some careful work done by the US Geological Survey.
  • They've published their results in this paper, who've actually worked out what are the acceptable values for this range for the elements.
  • And IUPAC has adopted it.
  • The question is, should you throw away your periodic table?
  • The answer is, if it's on a mug like my tea mug, throw it away, because it's disposable anyway.
  • But if you've got a nice one like this one here on the office wall, keep it, because the difference is very small, and it's not going to affect your daily life as a chemist.
  • So why would, for example, sulfur from volcano A be different from sulfur from crystal B?
  • Why is sulfur not a consistent blend of the isotopes?
  • Well, when you have isotopes, because of their different mass, it gives chemical bonds a very slightly different strength.
  • And if you start having different strength chemical bonds, the molecules react at different rates.
  • So if you have a whole series of reactions that are producing hydrogen sulfide or natural elemental sulfur, there will be different reactions, the different isotopes will have different rates, and so they'll wind up in different ratios.
  • Of course, the overall ratio in the universe will be fixed.
  • It's just it will be slightly different in one place and another.
  • It doesn't apply to chemists like me, but it will be important to people, for example, who are studying geology, looking at the elemental composition of rocks, where over millions of years there has been some change in the ratio.
  • For most chemists, they probably won't bother very much at all, because if you want to measure the mass of atoms or molecules very accurately, you will use a mass spectrometer, which will measure the mass of the individual isotopes.
  • And then the average atomic weight doesn't really matter very much at all.
  • So it's something that's interesting, it's fun, makes you think about chemistry again, but it's not something that's going to change our lives enormously.