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Question
The correct ground state electronic configuration of chromium atom is
Options:
A .  [Ar]3d5 4s1
B .  [Ar]3d4 s2
C .  [AR]3d6 4s0
D .  [Ar]4d5 4s1
Answer: Option A
:
A
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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