Why is the radius of oxygen is large than the radius of fluorine? In fluorine, there is more inter- electronic repulsion.
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Solution
3 main factors atomic radii;
1) nuclear attraction 2) electron shielding effect 3) no. of quantum shells filled
and since (2) and (3) are relative constant for the elements you have mentioned, electron-electron repulsion in an orbital is a small factor that starts to count.