Question

The pair of lanthanoid ions which are diamagnetic is:

Options

• Gd³⁺ and Eu³⁺

• Pm³⁺ and Sm³⁺

• Ce⁴⁺ and Yb²⁺

• Ce³⁺ and Eu²⁺

Answer 1

Ce⁴⁺ and Yb²⁺

Explanation:

The electronic configuration of Ce⁴⁺ is [Xe].

The electronic configuration of Yb²⁺ is [Xe].

In the above pair, all electrons are in paired form so this pair is diamagnetic.