Arsenic

General Information: Chemical Formula:As Composition:(Molecular Weight = 74.92 gm)Arsenic 100.0 % As Empirical Formula: As Environment:In ore veins in crystalline rocks. Locality:Saxony, Great Britain. Name Origin:From the Greek, Arsenikon, a name originally applied to the mineral orpiment.Physical Properties: Cleavage:[0001] Perfect Color:lead gray, gray, or white. Density:5.7 Diaphaniety:Opaque Habits:Nodular - Tuberose forms having irregular protuberances over the surface., Reniform - "Kidney like" in shape (e.g.. hematite)., Lamellar - Thin laminae producing a lamellar structure. Hardness:3.5 - Copper Penny Luminescence:None. Luster:, and glasses.Diagnostic tests: Arsenides, sulpharsenites, etc. (As^2-), give off fumes when roasted on charcoal, usually easily recognized by their peculiar garlic odor. In the open tube test, they give a white, volatile, crystalline sublimate of As₂O₃. In the closed tube test with sulfur, they yield a sublimate of dark brown-red when hot and red or reddish yellow when cold; or a black to gray mirror sublimate of metallic arsenic. Arsenates (AsO₄) can be detected by the garlic odor yielded when a mixture of the powdered mineral with charcoal dust and Na₂CO₃ is heated with a reducing flame on charcoal.More Details

Atomic Mass : 74.9216Atomic Number : 33Name Origins : Greek, arsenikon = "yellow orpiment."Year Discovered : 1230Discovery Credits : Probably first isolated by Alertus Magus (1193-1280).More Details

As