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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 of H is +1, but it is -1 in when combined with less electronegative elements. The oxidation number of oxygen in compounds is usually -2, but it is -1 in peroxides. The sum of the oxidation numbers of all the atoms in a neutral compound is 0. The oxidation number of H is +1 (Rule 1). If you know that HâOâ is hydrogen peroxide, you can immediately assign oxygen the ON = -1. If you don't know that HâOâ is hydrogen peroxide, you can use Rule 3. The oxidation number of H is +1.