JEE Main Chemistry question

Lanthanide contraction is due to increase in

(A)Shielding by -electrons
(B)Atomic numberCorrect
(C)Effective nuclear charge
(D)Size of -orbitals

Answer: (B)

Solution

As atomic number increases steadily across the lanthanide series, each new electron enters the poorly-shielding subshell, so the effective nuclear charge experienced by outer electrons steadily

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Question ID VK-147360