Which of the following has the maximum number of unpaired d electrons ?

Options

A. `Ni^(3+)`
B. `Cu^(+)`
C. `Zn^(2+)`
D. `Fe^(2+)`

Answer

D

Explanation

The electronic configuration of the ions are given below
`Ni^(3+)to1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(0)3d^(7)`