Question

The number of d-electrons in Fe²⁺ (At.no. of Fe = 26) is ______.

Options

• 2

• 4

• 6

• 8

Answer 1

The number of d-electrons in Fe²⁺ (At.no. of Fe = 26) is 6.

Explanation:

The atomic number of Fe is 26, so its electronic configuration is:

Fe = [Ar] 3d⁶ 4s²

In Fe²⁺, it loses 2 electrons, both from the 4s orbital, so:

Fe²⁺ = [Ar] 3d⁶

Thus, it has 6 d-electrons.