Question

How many unpaired electrons are present in $N{i}^{+2}$?

• A. 0
• B. 2
• C. 4
• D. 8

Answer 1

The correct option is B

2

The ground state electronic configuration of Nickel is:
$\left[Ar\right]3d^{8}4s^2$

Nickel will lose two electrons from its valence shell to form $N{i}^{+2}$ ion. The electronic configuration of $N{i}^{+2}$ ion is:
$\left[Ar\right]3d^8$

The way electrons of $N{i}^{+2}$ ion will get filled d- orbital is shown in the digram below:

There are two unpaired electrons present in the d orbital for $N{i}^{2+}$ ion.