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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.
Oxygen's most common oxidation state is â2, and the oxidation state â1 is also relatively common. With hydrogen it forms water and hydrogen peroxide. Organic oxygen compounds are ubiquitous in organic chemistry. Sulfur's oxidation states are â2, +2, +4, and +6. Sulfur-containing analogs of oxygen compounds often have the prefix thio-.