1.

Which of the following ion posses six unpaired electrons ?

Answer»

`Eu^(3+), Ce ^(3+), GD^(3+)`
`Eu^(3+), Tb ^(3+), SM ^(2+)`
`Tb ^(3+), Nd ^(3+), Sm ^(2+)`
`Sm ^(2+) , Er ^(3+) , Eu ^(2+)`

Answer :B


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