Which one of the following ions has electronic configuration `[Ar]3d^(6)` ? `(At. Nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)`

Options

A. `Ni^(3+)`
B. `Mn^(3+)`
C. `Fe^(3+)`
D. `Co^(3+)`

Answer

D

Explanation

`Co^(3+)`