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Question

The ionic radii of O2,F,Na+ and Mg2+ are in the order :

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

The correct option is A O2>F>Na+>Mg2+
O2 F Na+ Mg2+
Z 8 9 11 12
No. of e 10 10 10 10

In isoelectronic species greater the Z smaller the radius. So order is O2>F>Na+>Mg2+
A option is the correct answer

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