The pair of lanthanides in which both element | vedclass

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(B) The third ionization energy $(IE_3)$ is high for elements that have stable electronic configurations in their $+2$ oxidation state,as removing the

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$Eu, Yb$

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(B) The third ionization energy $(IE_3)$ is high for elements that have stable electronic configurations in their $+2$ oxidation state,as removing the third electron disrupts this stability.$Eu$ $(Z=63)$ has the configuration $[Xe] 4f^7 6s^2$. Its $Eu^{2+}$ ion is $[Xe] 4f^7$,which is a stable half-filled configuration.$Yb$ $(Z=70)$ has the configuration $[Xe] 4f^{14} 6s^2$. Its $Yb^{2+}$ ion is $[Xe] 4f^{14}$,which is a stable fully-filled configuration.Therefore,both $Eu$ and $Yb$ exhibit high third-ionization energy.

The pair of lanthanides in which both elements have high third-ionization energy is:

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