Element overview
Oxygen (O) is element 8 with a listed atomic mass of 15.999 u. It is in group 16 and period 2. Its category is nonmetal.
Atomic properties
Electron configuration: [He] 2s2 2p4. Electronegativity: 3.44. Common oxidation states: -2.
Physical properties
Density: 0.001429; melting point: 54.36; boiling point: 90.2. Values depend on conditions, phase and source.