A) \[{{K}^{+}},C{{l}^{-}},M{{g}^{2+}},S{{c}^{3+}}\]
B) \[N{{a}^{+}},C{{a}^{2+}},S{{c}^{3+}},{{F}^{-}}\]
C) \[{{K}^{+}},C{{a}^{2+}},S{{c}^{3+}},C{{l}^{-}}\]
D) \[N{{a}^{+}},M{{g}^{2+}},A{{l}^{3+}},Cl\]
Correct Answer: C
Solution :
Isoelectronic species are those which have same no. of electrons. \[{{K}^{+}}=19-1=18\] ; \[C{{a}^{+2}}=20-2=18\] \[S{{c}^{+3}}=21-3=18\] ; \[C{{l}^{-}}=17+1=18\]
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