JEE Advanced Chemistry question

The lanthanoid contraction is due to

(A)Filling of 4f before 4d
(B)Filling of 4d before 4f
(C)Filling of 4f before 5dCorrect
(D)Filling of 5d before 4f

Answer: (C)

Solution

In the lanthanide series, the subshell is being filled (for elements that, in period 6, lie before the subshell begins filling again at Hf onwards). Because electrons shield each other and the nucleus very

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Question ID VK-159786