A) \[{{K}^{+}}>C{{a}^{2+}}>S{{c}^{3+}}<T{{i}^{4+}}\]
B) \[{{S}^{2-}}>C{{l}^{-}}>Ar<{{K}^{+}}\]
C) \[{{O}^{2-}}>{{F}^{-}}>Ne>N{{a}^{+}}>M{{g}^{2+}}\]
D) \[N{{a}^{+}}>M{{g}^{2+}}>Ne>A{{l}^{3+}}\]
Correct Answer: C
Solution :
The value of radius increases on increasing negative charge while the value of radius decreases on increasing positive charge. Hence, the correct order of radius is as : \[{{O}^{2-}}>{{F}^{-}}>Ne>N{{a}^{+}}>M{{g}^{2+}}\] (For isoelectronic species, radius decreases with increase in atomic number)
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