Which of the following has the maximum number of unpaired electrons?

Options

A. `Mg^(2+)`
B. `Ti^(3+)`
C. `V^(3+)`
D. `Fe^(2+)`

Answer

D

Explanation

`Mg^(2+)=1s^(2)2s^(2)sp^(6)` no unpaired electron
`Ti^(3+)=1s^(3)2s^(2)2p^(6)3s^(2)3p^(6)3d^(1)` one unpaired electron
`V^(3+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(2)` two unpaired electron
`Fe^(2+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)` four unpaired electrons