Which of the following species is expected ot show the highest magnetic moment? (At.Nos.: `Cr = 24, Mn = 25, Co = 27, Ni = 28, Cu = 29`)

Options

A. `Cr^(2+)`
B. `Cu^(2+)`
C. `Mn^(2+)`
D. `Co^(2+)`

Answer

C

Explanation

Highest magnetic moment depends upon number of uparied electron since
`Cr^(2) = 3 d^(4) 4 s^(0), Mn^(2 +) = 3 d^(5) 4 s^(0)`
`Cu^(2 +) = 3 d^(9) 4 s^(0), Co^(2 +) = 3 d^(7) 4 s^(0), Ni^(2 +) = 3d^(6) 4 s^(0)`
So `Mn^(2 +)` contain maximum number of unparied electron i.e., 5.