Question

Halogens all but flourine show positive oxidation states

Answer 1

since it is most electronegative with small size and high effective nuclear charge thats why
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Answer 2

Fluorine, the most electronegative element, has no positive oxidation states, but the other halogens commonly exhibit +1, +3, +5, and +7 states. Most compounds containing halogens in positive oxidation states are good oxidizing agents, however, reflecting the strong tendency of these elements to gain electrons.