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Electronic Configuration

The number of...

Question

The number of electrons in the penultimate orbit of krypton atom are:

A

8

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B

2

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C

18

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D

32

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Solution

The correct option is C 18
The electronic configuration of $K r$ (36) is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6}$ . So 18 electrons are present in penultimate orbit of $K r$ .

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