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Q.

The correct ground state electronic configuration of chromium atom is

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a

$[Ar] 3 d^{6}$

b

$[Ar] 3 d^{4} 4 s^{2}$

c

$[Ar] 3 d^{5} 4 s^{1}$

d

$[Ar] 3 d^{5} 4 s^{2}$

answer is A.

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Detailed Solution

The half-filled (or) fully filled electronic configuration of orbitals are stable. So the $\bar{e}$ enter into the d-orbital.

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