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Give a reason for each of the following: The size of the trivalent cations in Lanthanoid series…

Chemistry20242 marksShort answer
Give a reason for each of the following:
(i)[1.0]
The size of the trivalent cations in Lanthanoid series decreases steadily as the atomic number increases.
(ii)[1.0]
The third ionization energy of manganese ($Z = 25$) is unexpectedly high.

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d-and f-Block Elements

From ISC 2024 Specimen Chemistry Paper 1, question 3.