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FORMULAS AND EQUATIONS



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

Valency

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

Valency

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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