7. General formula for the elements of halogen group is
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All halogens possess the oxidation state 0 in their diatomic forms. Fluorine exhibits the oxidation states of −1 (F− ion) and +1 (hypofluorous acid). The principal oxidation states of chlorine, bromine, and iodine are −1, +1, +3, +5, and +7. The oxyacids are compounds in which halogen atoms are joined to oxygen atoms
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