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Because oxygen in its natural state is a molecule of two oxygen atoms. Hence O2.

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Oxygen is a diatomic molecule, which means it's always found in nature as O2. Oxygen (and the other diatomic molecules) are never one atom because they are so reactive, they always bond with something else, therefore oxygen is O2. Other diatomic molecules are: Hydrogen (H2), Nitrogen (N2), and the halogens (Fluorine, Chlorine, Bromine, and Iodine)

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