MHT CET 2022 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2022

Which from following pair of elements have one electron in 5d - subshell in observed electronic configuration?

(A)Sm(Z = 61) and Eu (Z = 63)
(B)Lu (Z = 57) and Dy (Z = 66)
(C)Gd(Z = 64) and Lu ( Z = 71)Correct
(D)Ce (Z = 58) and Nd (Z = 60)

Answer: (C)

Solution

The observed configurations are: Sm (no 5d electron), Eu (no 5d), Dy (no 5d), Nd (no 5d), Ce (one 5d), Gd (one 5d, due to the extra stability of the half-filled 4f subshell), and Lu $

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Question ID VK-093854