1.

Which of the following lanthanoid ion is paramagnetic ?

Answer»

`CE^(4+)`
`Yb^(2+)`
`Lu^(3+)`
`Eu^(2+)`

SOLUTION :`Ce= [Xe] 4f^(1) 5d^(1) 6s^(2), Ce^(4+)= [Xe]`
`Yb= [Xe] 4f^(14) 6s^(2) , Yb^(2+) = [Xe] 4f^(14)`
`Lu = [Xe] 4f^(14) 5d^(1) 6s^(2) ,Ly^(3+) = [Xe] 4f^(14)`
`E U= [Xe]4f^(7)6s^(2) , Eu^(2+) = [Xe] 4f^(7)`
Thus, only `Eu^(2+)`hasunpaired electrons , vix.7.


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