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Q.

How many electrons are present in the valence shell of sodium atom?

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a

2

b

1

c

3

d

4

answer is A.

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Detailed Solution

Sodium is a metal, and the atomic number of sodium (Na) is 11.

So, the electronic configuration of sodium is: 2,8,1.

In sodium, the 'M' shell or third shell is the valence shell and it has one electron in it. Hence, there is 1 electron in the valence shell of Na.

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How many electrons are present in the valence shell of sodium atom?