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Atomic symbol - As
Atomic weight - 74.92159
Atomic number - 33
Electron configuration - 2-8-18-5
Oxidation states - .3, +5
State of matter - solid
Discovered in 1649
Melts at 814 .C

Arsenic is found in both the yellow and gray crystalline forms. Gray arsenic
is very brittle and tarnishes in the air. It sublimes under high heat. Because
arsenic is highly toxic, it makes a good weed killer and insecticide. The
radioactive isotopes have been used in medical diagnostic procedures.

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