A) \[R{{b}^{2+}}\]
B) \[B{{a}^{3+}}\]
C) \[S{{e}^{2-}}\]
D) \[S{{n}^{4+}}\]
Correct Answer: C
Solution :
:\[S{{e}^{2-}}\]due to inert gas configuration similar to krypton.
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