The number of unpaired electrons present in the ground state of Cr is

The number of unpaired electrons present in the ground state of Cr is

A
3
B
4
C
5
D
6

Solution:

The electronic configuration of Cr is $(1 s)^{2} (2 s)^{2} (2 p)^{6} (3 s)^{2} (3 p)^{6} (3 d)^{5} (4 s)^{1}$ .

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