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

Options

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

Answer

A

Explanation

`._(28)Ni = [Ar] 3d^(8) 4s^(2), Ni^(2+) = [Ar] 3d^(8)`
`._(29)Cu =[Ar] 3d^(10) 4s^(1), Cu^(+) = [Ar] 3d^(10)`
`Cu^(2+) =[Ar] 3d^(9)`