NEET 2020 Physics and Chemistry

Electronic configuration of Cr−[Ar]3d54s1
Electronic configuration of Cr2+−[Ar]3d4 Number of unpaired e−=4
Spin only magnetic moment =√n(n+2)
n = number of unpaired e−
Spin only magnetic moment =√4(4+2)
=√24BM
=4.9BM