A) \[C{{a}^{2+}}\]
B) \[C{{l}^{-}}\]
C) \[{{S}^{2-}}\]
D) \[{{K}^{+}}\]
Correct Answer: A
Solution :
\[C{{a}^{2+}},\,C{{l}^{-}},\,{{S}^{2-}}\] and \[{{K}^{+}}\] are isoelectronic species. In isoelectronic ions, size decrease with increasing nuclear charge. Hence, \[C{{a}^{2+}}\] ion is the smallest among these.
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