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Oxygene is a chemical element with the symbol O and atomic number 8. It is a highly reactive nonmetal and an oxidizing agent that readily forms compounds (notably oxides) with most elements. Oxygene is the third most abundant element in the universe, after hydrogen and helium, and the most abundant element by mass in the Earth's crust, making up about 46% of the Earth's crust. It is also the most abundant element in the human body, constituting about 65% of the mass of the average person.

Oxygene is essential for most forms of life on Earth. It is a key component of the Earth's atmosphere, making up about 21% of it by volume. It is also a major component of water, which is essential for life. Oxygene is used in a wide variety of applications, including medicine, industry, and as a propellant in rocket fuel. It is also used in the production of steel and other metals, as well as in the manufacture of glass and ceramics.

Oxygene has two stable isotopes, 16O and 18O, and one radioactive isotope, 15O. It has a melting point of -218.4°C and a boiling point of -183°C. It is a colorless, odorless, and tasteless gas at standard temperature and pressure. It is also a paramagnetic gas, meaning it is attracted to magnetic fields.