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 The  electronegativity   of fluorine  compare  to the  electronegativity   of oxygen and chlorine as below

Fluorine  has the highest electronegativity   than oxygen  and  chlorine.

 

  Explanation

 Generally  the  electronegativity    increase   across the period ( from the left to the right)  and  decreases down  the group.

  • Both oxygen and fluorine  are in period 2   in  periodic   table. since  fluorine is on  fur  right side as compared to oxygen , fluorine has higher  electronegativity than  oxygen.

  • On the  other side  Fluorine  and  chlorine are  in the same group in periodic table. fluorine  is at  the top of  the group  while chlorine  is at  the bottom therefore fluorine has  higher electronegativity  than chlorine.

Answer:

Fluorine is a smaller atom so when it forms a covalent bond, the shared electrons are closer to the nucleus and there is less shielding, electronegativity of oxygen is greater.

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