MHT CET 2022 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2022

Identify the element with smallest ionic radius in +3 oxidation state from following

(A)Yb
(B)Eu
(C)Er
(D)LuCorrect

Answer: (D)

Solution

Across the lanthanoid series the nuclear charge increases while the added electrons enter the inner 4f subshell, which shields poorly; hence the size of steadily decreases (lanthanoid contraction).

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Question ID VK-096986