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The valence electron configuration of an...

The valence electron configuration of an element with atomic number 23 is

A

`3d^(5)`

B

`3d^(3)4s^(2)`

C

`3d^(2)4s^(1)4p^(1)`

D

`3d^(2)4s^(2)4p^(1)`

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The correct Answer is:
B
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