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An Oxygen molecule has chemical formula O₂.

• O is a free oxygen atom and O2 is two oxygen atoms chemically bound to form an oxygen molecule.

• the difference between oxygen (O) and oxygen (O2) is that the former is an oxygen atom while the latter consists of two O atoms bound together, forming a molecule also called oxygen or chemical name dioxygen.

• Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe.

• At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2.

• Oxygen makes up almost half of the Earth's crust in the form of oxides.