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Question

The correct ground state electronic configuration of chromium atom is


A

[Ar]3d5 4s1

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B

[Ar]3d4 s2

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C

[AR]3d6 4s0

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D

[Ar]4d5 4s1

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Solution

The correct option is A

[Ar]3d5 4s1


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


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