Which of the following ion has the maximum magnetic moment?

Options

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

Answer

A

Explanation

`._(25)MN = [Ar]^(18) 3d^)(5) 4s^(2), Mn^(2+) = [Ar] 3d^(5)`
`._(26)Fe = [Ar]^(18) 3d^(6)4s^(2), Fe^(2+) = [Ar] 3d^(6)`
`._(22)Ti = [Ar]^(18) 3d^(2) 4s^(1) , Ti^(2+) = [Ar] 3d^(2)`
`._(24)Cr = [Ar]^(18) 3d^(5) 4s^(1), Cr^(2+) = [Ar] 3d^(4)`
`Mn^(2+)` has maximum number of unpaired electrons (S) and hence maximum magnetic moment.