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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.
Atomic number of oxygen: 8 After the IUPAC Tables, 2009 the atomic weight of oxygen is [15,99903; 15,99977]. The abridged conventional atomic weight is (also after the IUPAC â¦Tables, 2009) 15,999; following the IUPAC tradition the correct expression is atomic weight, not atomic mass.