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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 being supplied to a patient with an oxygen mask. Oxygen has an atomic number of eight and is found in great abundance on Earth. The atomic number of fluorine is number 9 on the periodic table of elements, and is identified with the symbol F. Ozone is made of three oxygen atoms. Tanks of oxygen for oxygen therapy.