My Saved Article |Atomic Number:||33||Atomic Symbol:||As|
|Atomic Weight:||74.9216||Electron Configuration:||2-8-18-5|
|Melting Point:||817 @ 28 atm.oC||Boiling Point:||sublimes @
613oC| |Uses:||LEDs, deadly poison, semiconductors| 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) SourcesElemental arsenic occurs in two solid
modifications: yellow, and gray or metallic, with specific
gravities of 1.97, and 5.73, respectively. is believed that
Albertus Magnus obtained the element in 1250 A.D. Schroeder
published two methods of preparing the element. arsenopyrite,
(FeSAs) is the most common mineral from which, on heating, the
arsenic sublimes leaving ferrous sulfide. PropertiesThe element
is a steel gray, very brittle, crystalline, semimetallic solid;
it tarnishes in air, and when heated is rapidly oxidized to
arsenous oxide with the odor of garlic. HandlingArsenic