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The rule that explain the reason for chr...

The rule that explain the reason for chromium to have `[Ar]3d^(5)``4s^(1)` configuration instead of `[Ar]3d^(4),4s^(2)` is

A

Pauli's exclusion principle

B

Aufbau principle

C

more exchange energy

D

Heisenberg's principle

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The correct Answer is:
C
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(A) : The electronic configuration of Cr is [Ar]3d^(5)4s^(1) but not [Ar]3d^(4)4s^(2) (R) : Lowering energy with configuration [Ar]3d^(5) 4s^(1) is more than that with configuration [Ar]3d^(4)4s^(2)

(A) : The electronic configuration of Cr is [Ar]3d^(5) 4s^(1) but not [Ar]3d^(4) 4s^(2) (R) : Lowering energy with configuration [Ar]3d^(5)4s^(1) is more than that with configuration [A]3d^(4)4s^(2)

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