1.

Which of the following has highest paired 4f electrons ?

Answer»

`Yb ^(3+)`
`Pr ^(3+)`
`Pm ^(3+)`
`Sm^(3+)`

Solution :`Yb^(3+)` has ELECTRONIC CONFIGURATION `6s^(0), 4F^(13), 5d^(0),` CONTAING 13 4f-electrons. Six paired electrons and only ONE unpaired electrons.


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