Q39 · CSIR-NET Chemistry, June 2012

Paper: CSIR-NET June 2012 · Subject: Inorganic Chemistry · Chapter: Lanthanides and Actinides · Topic: Lanthanides & Actinides – General · Marks: 2 · Difficulty: Easy

The pair of lanthanides with the highest third-ionization energy is:
(a)Eu, Gd
(b)Eu, Yb
(c)$\mathrm{Dy}, \mathrm{Yb}$
(d)Lu, Yb
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The third ionisation removes an electron from the especially stable f⁷ (Eu²⁺) and f¹⁴ (Yb²⁺) configurations, so Eu and Yb have the highest third IE.

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