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Which of the following lanthanoid ions is diamagnetic? (At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

1. Sm²⁺
2. Eu²⁺
3. Yb²⁺
4. Ce²⁺

Correct answer: Yb²⁺

Solution

Yb²⁺ is diamagnetic because it has a completely filled 4f subshell (4f¹⁴), resulting in no unpaired electrons. The other ions have unpaired electrons in their 4f orbitals, making them paramagnetic.

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