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GENERAL CHEMISTRY II 1 CHAPTER XIX INFO SHEET Rules for Assigning Oxidation Numbers to Inorganic Compounds 1. Elements and compounds with only one type of atom have oxidation number 0. 2. Ions have an oxidation number that is equal to their charge. 3. The sum of the oxidation numbers for each atom in a molecule must be equal to 0 for a neutral molecule and to the charge of the ion for a charged molecule. 4. The oxidation number of H in a compound is always +1, except in metallic hydrides (MHn), where it is -‐1. 5. The oxidation number of oxygen in a compound is always -‐2. Except: a. in peroxides, where it is -‐1. Peroxide ion: O22-‐ b. in superoxides, where is it -‐½. c. in OF2, where is it +2. 6. The oxidation number of Group IA Group IIA elements is usually +1 elements is usually +2.