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Short Note
Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.
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Solution
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. 
Concept: Periodic Properties
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