Question

The number of 4f electron in the ground state electronic configuration Gd²⁺ is ______. (Atomic number of Gd = 64)

Options

• 5

• 9

• 7

• 10

Answer 1

The number of 4f electron in the ground state electronic configuration Gd²⁺ is 7.

Explanation:

For Gd (z = 64)

Electronic configuration of Gd = [Xe] 4f⁷ 5d¹ 6s²

Electronic configuration of Gd²⁺ = [Xe] 4s⁷ 5d¹ 6s⁰

Number of 4f e^- in the ground state of Gd²⁺ is 7.