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Q.

The correct ground state electronic configuration of chromium atom is

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a

[Ar] 3d54s1

b

[Ar] 3d44s2

c

[Ar] 3d64s2

d

[Ar] 4d54s1

answer is A.

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Detailed Solution

3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. 1, 4s electron jump into 3d subshell for more stability.
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