Diatomic molecules: elements that exist as small molecules, containing only 2 atoms
E.g. H2, N2, O2, F2, Cl2, Br2, I2
The only other elements that exist as small molecules are phosphorus, P4 and sulfur, S8
*In equations, sulfur is written just as S, not S8
Binary compound: only contains 2 elements, ends in IDE
Polyatomic ion: and ion containing atoms of more than one element
Brackets are used when there is more than one polyatomic ion e.g. Mg(OH)2
Formula unit: the formula of an ionic compound
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