Which of the following metal ions will form complexes with the same magnetic moment and geometry irrespective of the nature of ligands ?

Options

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

Answer

C

Explanation

In presence of either strong field or weak field, the number of unpaired electron remains the same in case of `Cu^(2+)` ion.
`Cu rarr 3d^(10)4s^(1)`
`Cu^(2+)rarr 3d^(9)`