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

The electronic configuration of the given ions are as follows.
`{:(._(12)Mg^(2+)=1s^(2)2s^(2)2p^(6),"(No unpaired electron)"),(._(22)Ti^(3+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(1),"(One unpaired electron)"),(._(23)V^(3+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(2),"(Two unpaired electrons)"),(._(26)Fe^(2+)=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6),"(Four unpaired electrons)"):}`