D-And F-Block Elements Ques 510

Question: Which of the following lanthanoid ions is diamagnetic- (At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

Options:

A) $ S{{m}^{2+}} $

B) $ E{{u}^{2+}} $

C) $ Y{{b}^{2+}} $

D) $ C{{e}^{2+}} $

Show Answer

Answer:

Correct Answer: C

Solution:

$ S{{m}^{2+}}( Z=62 ) $ $ [ Xe ]4f^{6}6s^{2}-6 $ unpaired $ {{e}^{-}}E{{u}^{2+}}( Z=63 ) $

$ [ Xe ]4f^{7}6s^{2}-7 $ unpaired $ {{e}^{-}}Y{{b}^{2+}}(Z=70) $

$ [ Xe ]4f^{14}6s^{2}-0 $ unpaired $ {{e}^{-}}C{{e}^{2+}}(Z=58) $

$ [ Xe ]4f^{1}5d^{1}6s^{2}-2 $ unpaired $ {{e}^{-}} $

Only $ Y{{b}^{2+}} $ is diamagnetic.



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