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Halogens have maximum negative electron ...

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

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Halogens have the smallest size in their respective periods and therefore high effective nuclear charge. As a consequence, they readily accept one electron to acquire noble gas configuration.
(b) Fluorine is a stronger oxidising agent than chlorine, due to :
(i) Low enthalpy of dissociation of `F-F` bond.
(ii) High hydration enthalpy of fluorine.
(iii) Fluorine is the most electronegative element and cannot exhibit positive oxidation state. Other halogens have vacant d-orbitals and therefore, can expand their octests and show `+1,+3,+5 and +7` oxidation states also.
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