NEET 2014 Chemistry question

Reason of lanthanoid contraction is

(1)Negligible screening effect of 'f' orbitalsCorrect
(2)Increasing nuclear charge
(3)Decreasing nuclear charge
(4)Decreasing screening effect

Answer: (1)

Solution

Across the lanthanoids ( to ) electrons enter the inner subshell. The electrons shield each other (and the outer electrons) very poorly because of the diffuse shapes of orbitals, so the effective nuclear charge increases steadily as the atomic number rises and the atomic/ionic radii

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Question ID VK-091549