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Q.

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

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a

Eu2+

b

Yb2+

c

Ce2+

d

Sm2+

answer is B.

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Detailed Solution

Sm2+Z=62  :  Xe4f6 Eu2+Z=63  :  Xe4f7 Yb2+Z=70 :  Xe4f14 Ce2+Z=58 :  Xe4f15d1Only Yb2+is diamagnetic.
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Which of the following lanthanoid ions is diamagnetic?  (At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)