The atomic number of Ni and Cu are 28 and 29 respectively. The electronic configuration `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)` represents

Options

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

Answer

A

Explanation

Electronic configurations of :
`Ni-[Ar]3d^(8)4s^(2), " " Ni^(2+)-[Ar]3d^(8)`
`Cu-[Ar]3d^(10)4s^(1), " "Cu^(+)-[Ar]3d^(10)`
`Cu^(2+)-[Ar]3d^(9)`