Which of the following ions has the least magnetic moment?

Options

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

Answer

A

Explanation

Magnetic moment `(m)= sqrt(n(n + 2))BM`
where, n=number of unpaired electrons
`:. Cu^(2+)` has only one unpaired electron
`:. Cu^(2+)` has least magnetic moment.