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^(+)`

Answer

A

Explanation

(a) `Mn^(2+)(3d^(9)4s^(@)) to` 5 unpaired electrons.
(b) `Cu^(2+)(3d^(9)4s^(@)) to ` 1 unpaired electrons.
(c) `Sc^(2+)(3d^(1)4s^(@)) to ` 1 unpaired electron.
(d) `Cu^(+)(3d^(10)4s^(@)) to ` 0 unpaired electron.
`Mn^(2+)` ion is maximum paramagnetic in nature.