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Chemists use formulas and equations to save writing the full names of substances.


The valency of an atom can be used to work out the formula of a compound.


1 2 3 4
Na Sodium Mg Magnesium Al Aluminium C Carbon
K Potassium Ca Calcium…

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Predicting Valencies

There is a link between the valencies of an atom and its position in the periodic table.

Group 1 2 3 4 5 6 7
Valency 1 2 3 4 3 2 1

Chemical Equations

We often use word equations to describe what happens in a chemical reaction.…


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