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**Symbol:** As
**Atomic number:** 33
**International title:** arsenicum
**Relative Atomic Weight:** 74,9216
**Information:** The element of arsenic occurs in several allotropic modifications, the most common of which is grey arsenic. It is crystalline, fragile, glossy and semi-grey coloured. Its compound arsenic oxide (or arsenic) is a very powerful poison and it is supposed that it is the cause of the death of the French Emperor Napoleon Bonaparte.
**Use:** The arsenide gallia GaAs arsenide is used to produce semiconductors that are part of processors of every current computer.
**Occurrence:** Arsenic occurs very rarely on Earth. Among its minerals are arsenopyrite FeAsS.
**Structure:** Arsenic has a layered structure. It crystallizes into a kneel (trigonal) system.
