Atomic Number: 33
Atomic Weight: 74.92
Melting Point: 817 (gray)
Boiling Point: not known
Specific Gravity: 1.97 (yellow) 4.73 (black) 5.73 (gray)
Valence(s): -3,0,3, and 5
Albertus Magnus discovered arsenic in 1250. It is a native element found in two solid forms:
yellow and gray (metallic). It is also found in the minerals realgar and orpiment. Arsenic and its
compounds are poisonous, which makes them useful in poisons. It is also used for bronzing and
doping solid-state devices.
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