Question

Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.

Answer 1

Oxides of the first group elements have the common formula of M20.
Example- Na20, K20. This is because, the first group elements have a common valency of 1, and the valency of Oxygen is 2 so, to satisfy the combining capacity of Oxygen two 1st group metals are required.