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Question

Arrange the following as stated :
Increasing order of ionic size
N3,Na+,F,O2,Mg2+

A
Mg2+<Na<F<O2<N3.
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B
Na<Mg2+<F<O2<N3.
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C
O2<Na<F<Mg2+<N3.
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D
None of these
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Solution

The correct option is A Mg2+<Na<F<O2<N3.
The increasing order of ionic sizes is
Mg2+<Na<F<O2<N3.
All of these are isoelectronic ions.
In isoelectonic species, as the number of protons (atomic number) goes on increasing, size goes on decreasing due to stronger attraction on the electrons.

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