When we refer to breathing oxygen we are referring to the diatomic (made of two atoms) gas. O2 is the short hand for saying that there are two oxygen atoms bonded together. Nitrogen Oxygen Flourine Chlorine Bromine Iodine and Hydrogen only occur naturally in this diatomic form. Most elements are one atom.
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O2 is the chemical symbol for oxygen. if something has O2 in it it has 2 oxygen molecules=)
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