1.957-2.07 Sulfur has been known since ancient times, and can be found in the vicinity of volcanoes, hot springs, and in meteorites. Sulfur is a pale yellow, odorless, brittle solid, which is insoluble in water. There are eleven known isotopes of sulfur, with four of them occurring naturally. Sulfur is a component of gunpowder, is used in the vulcanization of natural rubber, and in the production of fertilizer. A tremendous amount of sulfur is used to produce sulfuric acid, the most important manufactured chemical.
Sulfur is a good electrical insulator.
Sulfur is also very important in organic compounds, being found in fats, body fluids, and skeletal minerals.