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Question

Why is valency always a whole number?

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Solution

Valency of an atom is the number of electrons donated or taken up in the formation of bond. Valency is always a whole number because number of electrons donated or shared cannot be fractional.For example Cl atom , its valence electronic configuration is 3s​23p5 , it requires one electron to complete its octet. So, its valency is 1.

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