Sulphur
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Sulfur, or sulphur, is a chemical element. Sulfur has the symbol S and an atomic weight of 32.065. It is a yellowish crystalline solid in its elemental form and it is an element essential for life. It is widely used in making sulfuric acid (H2SO4} and fertilizers.
The vast majority of the 66,000,000 metric tons of sulfur produced worldwide in 2006 was by-product sulfur recovered from petroleum refining and natural gas processing plants by the Claus process.[1]