Question

Which of the following has the maximum number of unpaired electrons?

Options

• Zn

• Fe²⁺

• Ni³⁺

• Cu⁺

Answer 1

Fe²⁺

Explanation:

Fe has an atomic number of 26, so Fe²⁺ has the electronic configuration:

[Ar] 3d⁶

In 3d⁶, there are 4 unpaired electrons.

Hence, Fe²⁺ has the maximum number of unpaired electrons.