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(a) Halogens have maximum negative gain ...

(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.

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Halogens have the smallest size and high effective nuclear charge in their respective periods . Thus they readily accept one electron to have noble gas configuration.
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