Which of the following Lanthanoid ions are di | vedclass

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Question

(B) species is diamagnetic if it has no unpaired electrons ($4f^0$ or $4f^{14}$ configuration).$La$ $(Z=57)$ has the electronic configuration $[Xe] 5d

Vedclass · Accepted Answer

$La^{3+}$ and $Ce^{4+}$

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(B) species is diamagnetic if it has no unpaired electrons ($4f^0$ or $4f^{14}$ configuration).$La$ $(Z=57)$ has the electronic configuration $[Xe] 5d^1 6s^2$. Thus,$La^{3+}$ is $[Xe] 4f^0$,which is diamagnetic.$Ce$ $(Z=58)$ has the electronic configuration $[Xe] 4f^1 5d^1 6s^2$. Thus,$Ce^{4+}$ is $[Xe] 4f^0$,which is diamagnetic.Therefore,both $La^{3+}$ and $Ce^{4+}$ are diamagnetic.

Which of the following Lanthanoid ions are diamagnetic?

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