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Q.

The number of valence electron in Na is 

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a

1

b

3

c

2

d

None of these

answer is A.

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Detailed Solution

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The number of the valence electrons in Na is 1. Valence electrons are the electrons that are present in the outermost shell of an element. Since, Na i.e. sodium has only one electron in its outermost shell its number of valence electron is 1.

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The number of valence electron in Na is