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As - Arsenic

Arsenic

 Arsenic 
As
Atomic Number: 33
Atomic Weight: 74.9216
Element Type: Non-Metal
Crystal Structure: Rhombohedral
Melting Point: 817.0°C = 1502.6°F = 1090.15 K
Boiling Point: 614.0°C = 1137.2°F = 887.15 K
Critical Temp: 1400.0°C = 2552.0°F = 1673.15 K
Atomic Radius: 1.33 Å (Å = Angstrom = 10-10 m)
Covalent Radius: 1.2 Å
Electronegativity: 2.18

History

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


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Werner Heisenberg
(1901-1976)





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