The correct order of ionic radii of Ce, La, Pm and Yb in +3 oxidation state is

Chemistry · Class 12 · CBSE — The d- and f-Block Elements

1. La³⁺ < Pm³⁺ < Ce³⁺ < Yb³⁺
2. Yb³⁺ < Pm³⁺ < Ce³⁺ < La³⁺
3. La³⁺ < Ce³⁺ < Pm³⁺ < Yb³⁺
4. Yb³⁺ < Ce³⁺ < Pm³⁺ < La³⁺

Answer

(B) Yb 3+ 3+ 3+ 3+

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