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Which halogen has the highest electronegativity of all elements?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — halogen Modern version of the periodic table of the elements.

Fluorine is the halogen with the highest electronegativity of all elements.12

Within the halogen group, electronegativity decreases as you move from fluorine through chlorine, bromine, and iodine to astatine. Fluorine’s extreme ability to attract electrons is a primary factor in its high chemical reactivity and its unique status as the only halogen that does not form compounds with positive oxidation states.21