GENERAL KNOWLEDGE

Detailed explanation-1: -And fluorine also has a very large electronegativity power. In fact, it is the most electronegative element in the periodic table. Due to which it is very reactive in nature. Hence, the high reactivity of fluorine is due to its high electronegative power.

Detailed explanation-2: -Fluorine is the most electronegative element but still its electron affinity is less than that of chlorine . It is because of the small size of fluorine. All the electrons in the atom repels the incoming electron significantly, this nullify the effect of higher electronegativity of fluorine over chlorine.

Detailed explanation-3: -Flourine is most reactive element. This is so because N, O and F have 5, 6, 7 electrons resp in their valence shell. thus, fluorine requires only one electron to complete its octet in comparison to nitrogen and oxygen, which require 2 and 3 electrons respectively. so the chemical reactivity increases from N to F.