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Question

Select the correct order of ionic radii.


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

The correct option is C $$O^{2-}\,>\,F^-\,>\,Na^+\,>\,Mg^{2+}$$
We know that for isoelectronic species, cations are smaller than neutral atoms which are in turn smaller than anions. Greater the effective nuclear charge, smaller will be the ionic radius.
Hence the correct order is $$O^{2-}\,>\,F^-\,>\,Na^+\,>\,Mg^{2+}$$.

Chemistry

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