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Oxygen is a chemical element with symbol O and atomic number 8. Its name derives from the Greek roots ὀξύς and -γόνος, because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless, odorless, tasteless diatomic gas with the formula O 2. This substance is an important part of the atmosphere, and is necessary to sustain most terrestrial life.