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Shortly thereafter, the name aluminum was adopted to conform with the "ium" ending of most elements, and this spelling is now in use elsewhere in the world. S. until 1925, at which time the American Chemical Society officially decided to use the name aluminum thereafter in their publications. S. and at about the same time by Heroult in France. Cryolite, a natural ore found in Greenland, is no longer widely used in commercial production, but has been replaced by an artificial mixture of sodium, aluminum, and calcium fluorides.

Html (1 of 2) [10/24/2001 5:40:08 PM] Magnesium It is also used as a reducing agent in the production of pure uranium and other metals from their salts. The hydroxide (milk of magnesia), chloride, sulfate (Epsom salts), and citrate are used in medicine. Deadburned magnesite is employed for refractory purposes such as brick and liners in furnaces and converters. Compounds Organic magnesium is important in both plant and animal life. Chlorophylls are magnesium-centered perphyrins. The adult daily nutritional requirement, which is affected by various factors include weight and size, is about 300 mg/day.

Y micro-m. 50/g. 9% pure costs about $50/lb; hyperpure silicon may cost as much as $100/oz. html (2 of 3) [10/24/2001 5:40:09 PM] Silicon Handling Miners, stonecutters, and others engaged in work where siliceous dust is breathed into large quantities often develop a serious lung disease known as silicosis. Isotopes Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society. 97376 Electron Configuration: [Ne]3s23p3 History (Gr. phosphoros, light bearing; ancient name for the planet Venus when appearing before sunrise) Brand discovered phosphorus in 1669 by preparing it from urine.

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PeriodicTable & History of Elements


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