Sulfur or sulphur is a chemical element with symbol S and atomic number 16. It is an abundant, multivalent non-metal. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a bright yellow crystalline solid when at room temperature. Chemically, sulfur can react as either an oxidant or reducing agent. It oxidizes most metals and several nonmetals, including carbon, which leads to its negative charge in most organosulfur compounds, but it reduces several strong oxidants, such as oxygen and fluorine.Symbol: S
Atomic number: 16
Electron configuration: Ne 3s2 3p4
Melting Point: 115.2 °C
Atomic mass: 32.065 ± 0.005 u
Discovered: 2000 BC