Pair of ions which are having same number of unpaired electrons

1.	Pair of ions which are having same number of unpaired electrons
Answer» `Eu^(3+), Tb^(3+)` `Eu^(3+), CE^(3+)` `Eu^(3+), Sm^(3+)` `Eu^(3+), PR^(3+)` Answer :A

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