The electronic configuration of `Cu^(2+)`ion is :

Options

A. `[Ar] 3d^5 4s^1`
B. `[Ar] 3d^4 4s^1`
C. `[Ar] 3d^7 4s^s`
D. `[Ar] 3d^8 4s^0`

Answer

B

Explanation

`Cu : [Ar] 3d^(10) 4s^(1)`
`Cu^(2+) : [Ar] 3d^9 4s^0` .