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The pair of lanthanoid ions which are diamagnetic is
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$\mathrm{Ce}^{4+}$ and $\mathrm{Yb}^{2+}$
Magnetic moment $\mu=\sqrt{n(n+2)}$
$\mathrm{n} \rightarrow$ number of unpaired electron
Hence $\mathrm{Ce}^{4+}$ and $\mathrm{Yb}^{2+}$ are only diamagnetic.
$\mathrm{n} \rightarrow$ number of unpaired electron
Hence $\mathrm{Ce}^{4+}$ and $\mathrm{Yb}^{2+}$ are only diamagnetic.
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