1.

Which of the following has all of its electrons paired ?

Answer»

`Pr ^(3+)`
`Ce ^(3+)`
`Tb ^(4+)`
none of these

Solution :`Pr^(3+)` has figuration `(4f^(2)),` 2 unpaired electrons. `Ce^(3+)(4f^(1))` configuration, 1 unpaired electrons. `Tb ^(4+)(4f^(7))` configuration , 1 unpaired electrons.
`Tb^(4+) (4f^(7))` configuration, 7 unpaired electrons.
All ions does not have PAIRED electrons.


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