1.

Among the following lanthanoid ions, the paramagnetic ion isA. `Yb^(2+)`B. `Eu^(2+)`C. `Lu^(3+)`D. `Ce^(4+)`

Answer» Correct Answer - B
The valence shell electronic configuration of the given ions are
`Yb=[Xe]4f^(14)6s^(2)impliesYb^(2+)=[Xe]4f^(14)implies` No unpaired `e^(-)`
`Eu=[Xe]4f^(7)6s^(2)impliesEu^(2+)=[Xe]4f^(7)implies7` unpaired `e^(-)`
`Lu=[Xe]4f^(14)5d^(1)6s^(2)impliesLu^(3+)=[Xe]4f^(14)implies` No unpaired `e^(-)`
`Ce=[Xe]4f^(1)5d^(1)6s^(2)impliesCe^(4+)=[Xe]implies` No unpaired `e^(-)`
Hence, `Eu^(2+)` is paramagnetic as it contains 7 unpaired electrons.


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