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Question

The correct ionic radii order is :


A
N3>O2>F>Na+
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B
N3>Na+>O2>F
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C
Na+>O2>N3>F
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D
O2>F>Na+>N3
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Solution

The correct option is A $$N^{3-}\,>\,O^{2-}\,>\,F^-\,>Na^+$$
We know that a cation is smaller than a neutral atom because of increased effective nuclear charge. Similarly an anion is larger than a neutral atom because of electron-electron repulsion.
Greater the magnitude of negative charge on an anion, greater will be the size of it.
Therefore, $$N^{3-}\,>\,O^{2-}\,>\,F^-\,>Na^+$$
Hence option A is the right answer.

Chemistry

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