Which of the followng has maximum number of unpaired electrons?

Options

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

Answer

D

Explanation

`Mg^(2+)` (0 unpaired electron)
`Ti^(3+)` (1 unpaired electron)
`V^(3+)`(2 unpaired electrons)
`Fe^(2+)` (4 unpaired electrons)