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−