Page 173 - Radiation Safety

• Matter –Anything that occupies space & has mass, exists

in three physical forms: solid, liquid and gas (e.g. diamond

water etc.)

• Compound -Consist of two or more

elements(e.g.water,H O is made up of 2 elements: H&O)
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• Elements –A substance that can’t be separated into

simpler substances, by chemical means. Examples are

carbon, oxygen, iron and lead. There are 109 known

elements

• Atoms –Basic units of an elements that can take part in

chemical combinations

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(12g of carbon contain 6.022 x 10 carbon atoms.) Travel with NASA
to the smallest
distance of the universe

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