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Element
is a substance that cannot be broken down to other substances by chemical reactions. Example: gold, copper, carbon, oxygen
Compound
is a substance consisting of two or more different elements combined in a fixed ratio.
What elements make up 96% of living matter?
Oxygen 65%
Carbon 18.5%
Hydrogen 9.5%
Nitrogen 3.3%
Trace element
An element indispensable for life but required in extremely minute amounts.
Neutron
A subatomic particle having no electrical charge ( electrically neutral), with a mass of about 1.7x10 ^-24g, found in the nucleus of an atom.
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