Correct Answer: Option A

Explanation

The ions  F\(^−\),Na\(^+\), Mg\(^{2+}\), Al\(^{3+}\) are isoelectronic species, meaning they all have the same number of electrons (10 electrons). For isoelectronic ions, the ionic size is determined by the nuclear charge (number of protons). As the number of protons increases, the attraction between the nucleus and the electrons becomes stronger, pulling the electrons closer and decreasing the ionic radius.

Order of Protons: 

F\(^−\) = 9 protons (Lowest charge → Largest size

Na\(^+\)= 11 protons

Mg\(^{2+}\)=12 protons

 Al\(^{3+}\)= 13 protons (Highest charge → Smallest size) 

Therefore, the decreasing order of ionic size is F\(^−\), Na\(^+\), Mg\(^{2+}\), Al\(^{3+}\)

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