The highest number of unapired electrons are present in

Options

A. `Fe^(0)`
B. `Fe^(4+)`
C. `Fe^(2+)`
D. `Fe^(3+)`

Answer

D

Explanation

The configuration of `Fe^(3+)` is `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(5)`. It has 5 unpaired electrons.