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Question

For Na+,Mg2+,F and O2 the correct order of increasing ionic radii is :

A
O2<F<Na+<Mg2+
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B
Mg2+<Na+<F<O2
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C
Mg2+<O2<Na+<F
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D
Na+<Mg2+<F<O2
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Solution

The correct option is B Mg2+<Na+<F<O2
All the species are iso-electronic (10e)

For iso-electronic species more the positive change, smaller the ionic radii.

For iso-electronic species more negative change, bigger the ionic radii

Hence the order is Mg2+<Na+<F<O2

Hence, the correct option is B.

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