Which of the following has maximum number of upnaired electrons ?

Options

A. `Fe^(2+)`
B. `Cr^(2+)`
C. `Fe^(3+)`
D. `Co^(2+)`

Answer

C

Explanation

`FE^(3+)=[Ar]^(18)""_(3)d^(5)`
It has 5- unpaired electron .
Where as ,` Cr^(3+)=[Ar]^(18)ed^(3)`
3-unpaire electons.
`Fe^(2+)=[Ar]^(18) 3e^(6)e`, unpaired electrons
3- upaired electrons