JEE Main 2005 Chemistry question

Which of the following factors may be regarded as the main cause of lanthanide contraction?

(1)Poor shielding of one of 4f electron by another in the subshellCorrect
(2)Poor shielding of one of 4f electron by another in the subshellCorrect
(3)Poorer shielding of 5d electrons by 4f electrons
(4)Greater shielding of 5d electrons by 4f electrons

Answer: (1),(2)

Solution

Across the lanthanides electrons are added to the diffuse 4f subshell; one 4f electron shields another very poorly, so the effective nuclear charge felt by the outer electrons rises steadily

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Question ID VK-038643