Q. The number of unpaired electrons in $1 s^{2}, 2 s^{2} 2 p^{3}$ is:

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A

1

B

2

C

3

D

5

Solution:

$1 s^{2}, 2 s^{2} 2 p^{3}$ can be shown as
Therefore, the number of unpaired electron is three.

Solution Image