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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.
The oxidation number for hydrogen is +1 when bonded to a nonmetal and â1 when. bonded to a metal. F. The oxidation number for oxygen is â2 unless it is in oxygen gas, ozone (O. 3), or a. peroxide (a compound containing the O. 2. 2â ion, where the oxidation number for oxygen.