Which of the following has maximum number of unpaired electrons?

Options

A. `Cu^(2+)(Z=29)`
B. `Fe^(3+)(Z=26)`
C. `Fe(Z=26)`
D. `P(Z=15)`

Answer

B

Explanation

`Cu^(2+),[Ar]3d^(9),`
`Fe^(3+):[Ar]3d^(5)` `P:[Ne]3s^(2)3p^(3)`
`Fe^(3+)`has maximum (five) unpaired electrons.