The valency of sodium is _____.

one

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two

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three

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four

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Solution

The correct option is A one
Valency is the combing capacity of an atom. It represents the number of electrons gain, lost or shared by an atom to achieve nearest noble gas configuration. It depends on the number of valence electrons.
Electronic configuration of sodium is 2,8,1. It has one valence electron. Thus, its valency is one.

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