Question

Which element from the following does not exhibit a magnetic moment in the +1 state?

Options

• Zn

• Co

• Cu

• Mn

Answer 1

Cu

Explanation:

Zn⁺ = [Ar] 3d¹⁰ 4s¹

Co⁺ = [Ar] 3d⁷ 4s¹

Cu⁺ = [Ar] 3d¹⁰

Mn⁺ = [Ar] 3d⁵ 4s¹

All ions have unpaired electrons, except Cu⁺.

∴ Cu⁺ does not exhibit a magnetic moment.