MHT CET Chemistry question

The atomic size of cerium and promethium is quite close, because

(A)they are in same period in periodic table
(B)their electronic configuration is same
(C)f-electrons have poor shielding effectCorrect
(D)nuclear charge is higher on cerium than promethium

Answer: (C)

Solution

The poor shielding by 4f electrons makes the effective nuclear charge increase and the size decrease only slightly along the series (lanthanoid contraction), so neighbouring lanthanoids

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Question ID VK-074833