Sulfur is a chemical element with the symbol S and atomic number 16. It has a melting point of 388.36K and boiling point of 717.87K. Sulfur is found in native form in volcanic regions and forms sulfides and sulfates, and is necessary for protein synthesis in living organisms. It is mainly used as a fertilizer but also in the manufacture of gunpowder, laxatives, matches, and insecticides.