A) \[Ce\]
B) \[Eu\]
C) \[Sm\]
D) \[Nb\]
E) \[Gd\]
Correct Answer: B
Solution :
Among lanthanide ions the most stable +2 oxidation state is exhibited by europium (Eu).\[E{{u}^{2+}}\]is stable because of its half-filled\[4{{f}^{7}}\]electronic configuration.
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