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The pair of lanthanoid ions which are diamagnetic is

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The pair of lanthanoid ions which are diamagnetic is

a

\(P{m}^{3+}\) and \(S{m}^{3+}\)

b

\(C{e}^{4+}\) and \(Y{b}^{2+}\)

c

\(C{e}^{3+}\) and \(E{u}^{2+}\)

d

\(G{d}^{3+}\)and \(E{u}^{3+}\)

✓ Correct answer: b)

\(C{e}^{4+}\) and \(Y{b}^{2+}\)

Explanation

Ce⁴⁺ has a 4f⁰ configuration (no unpaired electrons) and Yb²⁺ has a 4f¹⁴ configuration (all f‐orbitals filled). Both ions are diamagnetic.

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