A) \[{{K}^{+}},C{{l}^{-}},C{{a}^{2+}},S{{c}^{3+}}\]
B) \[B{{a}^{2+}},S{{r}^{2+}},{{K}^{+}},{{S}^{2-}}\]
C) \[{{N}^{3-}},{{O}^{2-}},{{F}^{-}},{{S}^{2-}}\]
D) \[L{{i}^{+}},N{{a}^{+}},M{{g}^{2+}},C{{a}^{2+}}\]
Correct Answer: A
Solution :
Isoelectronic are those species which have same number of electrons\[{{K}^{+}},C{{l}^{-}},C{{a}^{2+}},S{{c}^{3+}}\].(all are having 18 electrons).
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