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Chlorine, bromine of iodine can exhibit-...

Chlorine, bromine of iodine can exhibit-1 and +1 states, while fluorine can exhibit only 1, but not +1. Why?

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General valency of halogens is one. When chlorine (or bromine or iodine) is mono- valent with more electronegative elements, it exhibits +1 state. Fluorine can never exhibit positive oxidation state
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