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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. html (2 of 3) [3/6/2001 8:38:07 AM] Silicon 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.

Sources The principal ores of zinc are sphalerite (sulfide), smithsonite (carbonate), calamine (silicate), and franklinite (zine, manganese, iron oxide). One method of zinc extraction involves roasting its ores to form the oxide and reducing the oxide with coal or carbon, with subsequent distillation of the metal. Isotopes Naturally occurring zinc contains five stable isotopes. Sixteen other unstable isotopes are recognized. Properties Zinc is a bluish-white, lustrous metal. It is brittle at ordinary temperatures but malleable at 100 to 150oC.

Clad dimes and quarters are made of an outer layer of 75% Cu and 25% Ni bonded to a central core of pure Cu. The composition of the one- and five-cent pieces remains unchanged. One-cent coins are 95% Cu and 5% Zn. Five-cent coins are 75% Cu and 25% Ni. Old silver dollars are 90% Ag and 10% Cu. Earlier subsidiary coins of 90% Ag and 10% Cu officially were to circulate alongside the old coins; however, in practice they have largely disappeared (Gresham's Law), as the value of the silver is now greater than their exchange value.

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