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In addition, groups may be idenitifed by the first element in each group-so the Group 16 elements is sometimes called the oxygen group. There is considerable confusion surrounding the Group labels.
1 For instance, in the molecule H 2 O 2 (hydrogen peroxide), oxygen has an oxidation number (and a charge) of -1.Also when oxygen is part of a superoxide its oxidation number is -0.5. 2  When oxygen is bound to fluorine, its oxidation number is +2. 3  See Fluorine rule below for more info.In (O 2 F 2) it is +1.