Oxygen is a chemical element with symbol O and atomic number 8. Its name derives from 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 O2. This substance is an important part of the atmosphere, and is necessary to sustain most terrestrial life.Symbol: O
Atomic number: 8
Electron configuration: 1s2 2s2 2p4
Atomic mass: 15.9994 ± 0.0004 u
Discoverers: Carl Wilhelm Scheele, Joseph Priestley