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Work out the formulae for the following compounds :
(a) Sodium oxide
(b) Calcium carbonate
(a) Valency of Sodium = 1
Valency of Oxygen = 2
![""](/assets/questions/media/151_20_a.png)
Formula for sodium oxide can be worked out by crossing the valency of the constituent elements.
Therefore, formula for sodium oxide is: Na2O.
(b) Valency of Calcium = 2
Valency of Carbonate ion = −2
![""](/assets/questions/media/151_20_b.png)
Formula for calcium carbonate can be worked out by crossing the valency of the constituent elements/ions.
Therefore, formula for calcium carbonate is: CaCO3.
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