The oxidation number of an uncombined element is 0
The sum of the oxidation numbers in a compound is 0, in an ion it equals the overall charge
In compounds the oxidation numbers of Group 1 metals is +1 and Group 2 metals is +2
The oxidation number of oxygen is -2 in compounds except with fluorine or in peroxides
The oxidation number of hydrogen is 1 in compounds, except with metal hydrides
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