A) \[{{S}^{2-}}\]
B) \[Ar\]
C) \[C{{a}^{2+}}\]
D) \[T{{i}^{4+}}\]
Correct Answer: D
Solution :
These all ions are isoelectronic \[({{e}^{-}}=18)\] and size of isoelectronic species decrease with increase in nuclear charge. Hence, among these, \[T{{i}^{4+}}(Z=22)\] will be the smallest.
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