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.
