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Question

In iso-electronic species O2, F and Na+, size is affected by:

A
Nuclear charge (Z) of the element
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B
Valence principal quantum number
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C
Electron-electron interactions in the outer orbitals
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D
None of the factors because their size is the same
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Solution

The correct option is A Nuclear charge (Z) of the element
Size of an iso-electronic species increases with a decrease in the nuclear charge Z.
The order of increasing nuclear charge is O2 < F < Na+
So the order of increasing size is:
Na+ < F < O2

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