MHT CET 2022 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2022

Identify the correct decreasing order of atomic radii from following

(A)Ce > Tm > Pm > Yb
(B)Ce > Pm > Tm > YbCorrect
(C)Pm > Yb > Ce > Tm
(D)Pm > Tm > Ce > Yb

Answer: (B)

Solution

Across the lanthanoid series the atomic/ionic radii decrease steadily with increasing atomic number (lanthanoid contraction), because the 4f electrons shield the nuclear charge poorly. The atomic numbers are Ce = 58, Pm = 61, Tm = 69, Yb

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Question ID VK-097138