1.

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

Answer»

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

Solution :`Sm^(2+)(Z=62)`
`[XE]4f^6 - 6 " unpaired " e^- "" Eu^(2+)(Z=63)`
`[Xe]4f^(7)6S^2 -7 " unpaired "e^- ""Yb^(2+)(Z=70)`
`[Xe]4f^(14)6s^(2)-0 " unpaired " e^- "" Ce^(2+)(Z=58)`
`[Xe]4f^1 5d^1 6s^2 -2` unpaired `e^-`only `Yb^(2+)` is diamagnetic .


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