Which of the following ions has the maximum magnetic moment in aqueous solution ?

Options

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

Answer

C

Explanation

The magnitude of magnetic moment is directly related to the number of unpaired electrons:
`Ti(Z = 22):[Ar]3d^(2)4s^(2)`, thus `Ti^(2+)`has `2` unpaired electorns.
`Cr(Z = 24):[Ar]3d^(5)4s^(1)`, thus `Cr^(2+)`has `4` unpaired electrons.
`Mn(Z = 25): [Ar]3d^(5)4s^(2)`, thus `Mn^(2+)`has `5` unpaired electrons.
`Fe(Z = 26):[Ar]3d^(6)4s^(2)`, thus `Fe^(2+)`has `4` unpaired electorns.