Question

The number of unpaired electrons in Ni²⁺ is ______.

Options

• 0

• 2

• 4

• 8

Answer 1

The number of unpaired electrons in Ni²⁺ is 2.

Explanation:

Nickel (Ni) has an atomic number of 28, so its electronic configuration is:

Ni = [Ar] 3d⁸ 4s²

For Ni²⁺, it loses two electrons from the 4s orbital:

Ni²⁺ = [Ar] 3d⁸

In the 3d⁸ configuration, there are 2 unpaired electrons.