Group 17 elements form compounds in odd oxidation states.

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Group 17 elements (halogens) have 7 valence electrons and tend to gain 1 electron to achieve a stable octet configuration. Therefore, they typically form compounds in even oxidation states (-1, 0, +1, +2, +3, +4, +5, +6, +7) by either gaining or sharing electrons with other elements. However, under certain conditions, they can form compounds in odd oxidation states such as +1, +3, +5, and +7.

Group 17 Elements Form Compounds in Odd Oxidation States