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This Visual Summary presents the keywords and the summaries of the Wikipedia article about "Sulfur". The Visual Summary map and the Keyword Cloud were automatically created by WikiSummarizer.
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Wikipedia article: Sulfur
· 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.
· Elemental sulfur crystals are commonly sought after by mineral collectors for their brightly colored polyhedron shapes.
· Many sulfur compounds are odiferous, and the smell of odorized natural gas, skunk scent, grapefruit, and garlic is due to sulfur compounds.
· Sulfur is an important part of many enzymes and in antioxidant molecules like glutathione and thioredoxin.
· In most forest ecosystems, sulfate is derived mostly from the atmosphere; weathering of ore minerals and evaporites contribute some sulfur.
· Fossil-based sulfur deposits from salt domes have until recently been the basis for commercial production in the United States, Poland, Russia, Turkmenistan, and Ukraine.
· Today, sulfur is produced from petroleum, natural gas, and related fossil resources, from which it is obtained mainly as hydrogen sulfide.
· This process entails oxidation of some hydrogen sulfide to sulfur dioxide and then the comproportionation of the two: Owing to the high sulfur content of the Athabasca Oil Sands, stockpiles of elemental sulfur from this process now exist throughout Alberta, Canada.
· Reduction of elemental sulfur gives polysulfides, which consist of chains of sulfur atoms terminated with S centers: This reaction highlights arguably the single most distinctive property of sulfur: its ability to catenate (bind to itself by formation of chains).
· Not all organic sulfur compounds smell unpleasant at all concentrations: the sulfur-containing monoterpenoid grapefruit mercaptan in small concentrations is responsible for the characteristic scent of grapefruit, but has a generic thiol odor at larger concentrations.
· Being abundantly available in native form, sulfur (Latin sulphur) was known in ancient times and is referred to in the Torah (Genesis).
· Elemental sulfur is mainly used as a precursor to other chemicals.
· Reduced glutathione, a sulfur-containing tripeptide, is a reducing agent through its sulfhydryl (-SH) moiety derived from cysteine.
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