Why do halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table?

Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table. Why?

Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table. Why ?

Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table. Why ?

Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table. Why ?

(A) Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table (R ) Halogens have the smallest size in their respective periods and high effective nuclear charge

(a) Halogens have maximum negative gain enthalpy in the respective periods of the periodic table. Why? (b) Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine . Why? Fluorine exhibits only-1 oxidation state, whereas other halogens exhibit +1,+3,+5, and +7 oxidation states also. Explain.