Question

The correct ionic radii order is :

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

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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