Which of the following transition metal ions has highest magnetic moment ?

Options

A. `Cu^(2+)`
B. `Ni^(2+)`
C. `Co^(2+)`
D. `Fe^(2+)`

Answer

D

Explanation

More the number of upaired d-electrons, more is the magnetic moment.
`Cu^(2+)-3d^9` No.of unpaired electrons = 1
`Ni^(2+)-3d^8` No. of unpaired electrons = 2
`Co^(2+)-3d^7` No. fo unpaired electrons = 3
`Fe^(2+) - 3d^6` No. of unpaired electron = 4