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Title: Chemistry/Elements/Chlorine - LANL: Chlorine History, properties, uses, and handling.
Lenntech__Chlorine Physical data, chemical properties, health and environmental effects.

Visual_Elements__Chlorine Image, animation, uses, biological role, and key isotopes.

WebElements__Chlorine Extensive information on history, uses, occurrence, compounds, and properties of the element.

Wikipedia__Chlorine Properties of the element, including its history, applications, and characteristics.

Biological_Macromolecule_Crystallization_Database_(BMCD) Contains crystal data and the crystallization conditions, which have been compiled from literature. Also contains the NASA Protein Crystal Growth Archive, which includes the crystallization data gener

Cambridge_Structural_Database_(CSD) Contains crystal structure information, chemical, and bibliographic data for about 400,000 organic and metal-organic compounds.


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Chlorine /* No Right Click Copyright Mike McGrath (http://website.lineone.net/~mike_mcgrath/) To add more shock to your site, visit www.DHTML Shock.com */ Back to Periodic Table         Chlorine Atomic Number: 17 Atomic Radius: 99 pm Atomic Symbol: Cl Melting Point: -101.5 șC Atomic Weight: 35.453 Boiling Point: -34.4 șC Electron Configuration: [Ne]3s23p5 Oxidation States: 7, 5, 1, -1

History

(Gr. chloros: greenish yellow) Discovered in 1774 by Scheele, who thought it contained oxygen. Chlorine was named in 1810 by Davy, who insisted it was an element.

Sources

In nature it is found in the combined state only, chiefly with sodium as common salt (NaCl), carnallite, and sylvite.

Properties

It is a member of the halogen (salt-forming) group of elements and is obtained from chlorides by the action of oxidizing agents and more often by electrolysis; it is a greenish-yellow gas, combining directly with nearly all elements. At 10oC one volume of water dissolves 3.10 volumes of chlorine, at 30oC only 1.77 volumes.

Uses

Chlorine is widely used in making many everyday products. It is used for producing safe drinking water the world over. Even the smallest water supplies are now usually chlorinated. It is also extensively used in the production of paper products, dyestuffs, textiles, petroleum products, medicines, antiseptics, insecticides, food, solvents, paints, plastics, and many other consumer products. Most of the chlorine produced is used in the manufacture of chlorinated compounds for sanitation, pulp bleaching, disinfectants, and textile processing. Further use is in the manufacture of chlorates, chloroform, carbon tetrachloride, and in the extraction of bromine. Organic chemistry demands much from chlorine, both as an oxidizing agent and in substitution, since it often brings many desired properties in an organic compound when substituted for hydrogen, as in one form of synthetic rubber.

Handling

Chlorine is a respiratory irritant. The gas irritates the mucus membranes and the liquid burns the skin. As little as 3.5 ppm can be detected as an odor, and 1000 ppm is likely to be fatal after a few deep breaths. In fact, chlorine was used as a war gas in 1915. Exposure to chlorine should not exceed 0.5 ppm (8-hour time-weighted average - 40 hour week.) Title Picture: Some tree frogs contain a chlorine compound in their skin that is a very powerful pain killer, which is two hundred times more potent than any known pain killer. This chemical, when used in small doses, has no side effects; in large doses, however, it is fatal.   Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society. Chemistry Division HomeLANL Home Last Updated: 12/15/2003,© Chemistry Operations Operated by the University of California for the US Department of Energy   | Help | Copyright © UC 2003 | Disclaimer  
 

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