Cl >F>I
In decreasing order of electron affinity
An element’s electron affinity can be defined as its ability to attract electrons from any nearby source, even if it is not bonded with another element.
An element’s power to attract electrons from another element is called electron negativity.
So, the electronegativity for fluorine and chlorine are highest while their electroaffinity is highest.
Although electronegativity is too high for F, because of its small size, the lone pairs electrons in 2nd shell prevent electrons from coming to them.