Atomic StructureHard

Question

The corrent ground state electronic configuration of chromium atom is :

Options

A.[Ar] 3d5 4s1
B.[Ar] 3d4 4s2
C.[Ar] 3d6 4s0
D.[Ar] 3d6 4s1

Solution

Expected configuration 3d4. 4s2 is less stable than 3d5 4s1, which is more stable due to half-filled sub-shells. 3d5, 4s1 configuration is supported gy magnetic moments also.

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