1.

4f^(2) 5d^(0) 6s^(0) is the electronic configuration of lanthanoide ion

Answer»

only `Eu^(2+)`
only `Gd ^(3+) and Eu ^(2+)`
only `Eu^(2+) , Gd ^(3+) and Tb ^(4+)`
only `Eu^(2+) and Tb ^(2+)`

Answer :C


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