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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.
exists and is an alternate of . Oxygen are classified into many things. For example, on the periodic table, oxygen is classified as a nonmetal gas with an atomic number of 8 and atomic weight of 15.9994. In addition, it has 6 valence electrons.