The bivalent metal ion having maximum paramagnetic behaviour among the first transition series elements is

Options

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

Answer

A

Explanation

`Mn^(2+) (3d^5 4s^0) to 5 ` unpaired electrons.
`Cu^(2+) (3d^9 4s^0) to 1 ` unpaired electron
`Sc^(2+) (3d^1 4s^0) to 1 `unpaired electron
`Cu^+ (3d^(10) 4s^0 ) to 0 ` unpaired electron
Hence , `Mn^(2+)` has maximum number of unpaired thus, it shows maximum paramagnetic behaviour