Which of the following ion has lowest magnetic moment?

Options

A. `Fe^(2+)`
B. `Mn^(2+)`
C. `Cr^(3+)`
D. `V^(3+)`

Answer

B

Explanation

`Fe^(2+)-[Ar]3d^6`
`Mn^(2+)-[Ar]3d^5`
`Cr^(3+)-[Ar]3d^4`
`V^(3+)[Ar]3d^1`
clearly `Mn^(2+)` has maximum number of unpaired electrons therefore it has highest magnetic moment.