Question

what is valency? Write valency of hydrogen

Answer 1

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The electronic configuration of sodium can be written as 2, 8, 1. 2, 8, 1 electrons are distributed in the shells K, L, M respectively. Therefore, valence electron in sodium is 1 and it needs to lose 1 electron from the outermost orbit to attain octet. Hence, the valency of sodium is 1.

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Answer 2

Valency is combining capacity of elements.
Valency of hydrogen =+1