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The size of isoelectronic species O^(-2)...

The size of isoelectronic species `O^(-2) F^(-)` and `Na^(+)` is affected by:

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`O^2 lt F lt Na^+ lt Mg^(2+)`. As dictated above, greater the positive charge, smaller the size of the cation and hence closer the valence electrons to the nucleus. Increased effective nuclear charge results in the valence electrons being tightly bound to the nucleus causing the ionization energy to increase
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