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Ionisation enthalpies of \text {Ce, Pr and Nd} are higher than \text {Th, Pa and U}. Why?

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6th period elements like \text {Ce, Pr and Nd} have smaller sizes as compared to 7th period elements like \text {Th, Pa and U} . As the size of atom increases, the removal of electron becomes easier (increased distance between outermost electrons and nucleus).

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