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) 2p^(6)=` no unpaired electron
`Ti_(3+)= 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(2)=` two unpaired electrons
`Fe^(2+)=1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(6)=` four unpaired electrons