i. A2O – Valency of group one is 1 and of oxygen is 2
The formula for group 1 oxides is A2O, where A is the group 1 element and O is oxygen.
ii. AX3 – Valency of group 13 is 3 and of halogen is 1
Formula for the halides of group 13 is AX3 where A is the group 13 element and X is the halogen.
iii. AB2- Valency of element A of group 2 is 2 and that of element B of group seventeen is 1.
A of group 2 has a valency of 2 and it combines with an element, B of group seventeen which has the valency 1. Therefore the formula is AB2
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