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

Options

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

Answer

D

Explanation

`Mg^(2+)=10` electrons, `1s^(2)2s^(2)p^(6)` - No unpaired electron
`Ti^(3+)=19` electrons, `1s^(2)2s^(2)p^(6)3s^(2)p^(6)3d^(1)` One unpaired electrons
`V^(3+)=20` electron, `1s^(2)2s^(2)p^(6)3s^(2)p^(6)3d^(2)` two unpaired electrons
`Fe^(2+)=24` electron, `1s^(2)2s^(2)p^(6)3s^(2)p^(6)3d^(6)`- Four unpaired electrons.