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  4. The pair of lanthanides with the highest third ionization energy is

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Q. The pair of lanthanides with the highest third ionization energy is

The d-and f-Block Elements

Solution:

$Eu=\left[Xe\right] 4f^{1}5d^{0}6s^{2}$ and $Yb=\left[Xe\right]4f^{14} 5d^{0} 6s^{2}$ Removal of $3^{rd}$ electron requires more energy from these elements.