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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.
It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms oxides with most elements as well as other compounds. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O.