How many unpaired electrons are there in `Ni^(2+)` ion if the atomic number of `Ni` is `28`.

Options

A. 0
B. 2
C. 4
D. 8

Answer

B

Explanation

`Ni (Z = 28) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(2) 3d^(8)`

`Ni^(2+) (Z = 28) : 1s^(2) 2s^(2) 2p^(6)3s^(2) 3p^(6) 3d^(8)`
Number of unpaired electrons in `Ni^(2+) : 2`.