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Valency

The number of...

Question

The number of electrons present in the valence shell of an atom with atomic number 38 is :

A

2

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B

10

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C

1

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D

8

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Solution

The correct option is A 2
The electronic configuration of strontium ,with atomic number 38 is; $[A r] 3 d^{10} 4 s^{2} 4 p^{6} 5 s^{2}$
Therefore number of electrons in valence shell = 2.

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