Answer :

i. A_{2}O – Valency of group one is 1 and of oxygen is 2

The formula for group 1 oxides is A_{2}O, where A is the group 1 element and O is oxygen.

ii. AX_{3} – Valency of group 13 is 3 and of halogen is 1

Formula for the halides of group 13 is AX_{3} where A is the group 13 element and X is the halogen.

iii. AB_{2}- 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 AB_{2}

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