1.

Which of the following lanthanoid ions is diamagnetic (At. No. Ce = 58, Sm = 62, Eu = 63, Yb = 70)

Answer»

`YB^(2+)`
`CE^(2+)`
`Sm^(2+)`
`Eu^(2+)`

Solution :Dimagnetic - no unpaired electron present
`Yb^(2+)=70[Xe]6s^(@)4 F^(14)5d^(@)` unpaired `e^(-)`=zero.


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