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Title: Chemistry/Elements/Arsenic - LANL: Arsenic History, properties, and uses.
Lenntech__Arsenic Physical data, chemical properties, health and environmental effects.

Periodic_Table_of_the_Elements__Arsenic Thermal properties, ionisation energies, and reduction potentials.

Radiochemistry_of_Arsenic Full text of the monograph by J. G. Cuninghame (Atomic Energy Research Establishment, Harwell, Didcot, Berkshire, England). [PDF]

USGS_-_Minerals_Information__Arsenic Overview and a number of publications in PDF format.

Visual_Elements__Arsenic Source, biological role, physical information, and key isotopes.

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


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Arsenic /* 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 the Periodic Table      Arsenic Atomic Number: 33 Atomic Radius: 125 pm Atomic Symbol: As Melting Point: ~817 ºC Atomic Weight: 74.9216 Boiling Point: 603 ºC (sublimation) Electron Configuration: [Ar]4s23d104p3 Oxidation States: 5, 3, -3

History

(L. arsenicum, Gr. arsenikon: yellow orpiment, identified with arenikos: male, from the belief that metals were different sexes; Arabic, Az-zernikh, the orpiment from Persian zerni-zar, gold) Elemental arsenic occurs in two solid modifications: yellow, and gray or metallic, with specific gravities of 1.97, and 5.73, respectively. It is believed that Albertus Magnus obtained the element in 1250 A.D. In 1649 Schroeder published two methods of preparing the element. Mispickel arsenopyrite, (FeSAs), is the most common mineral from which, on heating, the arsenic sublimes leaving ferrous sulfide.

Properties

The element is a steel gray, very brittle, crystalline, semimetallic solid; it tarnishes in air, and when  it is heated it rapidly oxidizes to arsenous oxide, which smells of garlic. Arsenic and its compounds are poisonous.

Uses

Arsenic is used in bronzing, pyrotechny, and for hardening and improving the sphericity of shot. The most important compounds are white arsenic, the sulfide, Paris green, calcium arsenate, and lead arsenate; the last three have been used as agricultural insecticides and poisons. Marsh's test makes use of the formation and ready decomposition of arsine. Arsenic is finding increasing uses as a doping agent in solid-state devices such as transistors. Gallium arsenide is used as a laser material to convert electricity directly into coherent light. Title Picture: Alchemical symbol for arsenic Sources: CRC Handbook of Chemistry and Physics and the American Chemical Society. Chemistry Division HomeLANL Home Last Updated: 10/20/2003,© Chemistry Operations Operated by the University of California for the US Department of Energy   | Help | Copyright © UC 2003 | Disclaimer  
 

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