Arsenic

Arsenic is found in several allotropic forms and has both metallic and non-metallic properties. The grey metallic allotrope is a brittle, crystalline solid which tarnishes readily in air and burns in oxygen. It is resistant to attack by dilute acids and alkalis, but will react with hot acids and molten NaOH. Arsenic is poisonous (it is thought to have been responsible for the death of Napoleon) and occurs both free and combined in many minerals. Applications for grey arsenic include its use as an alloying element, its use in the manufacture of certain types of glass and as a donor impurity in germanium semiconductor devices. The non-metallic allotropes include yellow arsenic (may be formed by rapid condensation of Arsenic vapour in an inert atmosphere) and black arsenic (may be formed by slow condensation of the vapour in an inert atmosphere).


Symbol
As

Discovered
13th. century by Albertus Magnus (although believed to have been used much earlier as an alloying addition to bronze to provide a lustrous finish).

Abundance
1.5 ppm of the Earth's crust.

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Atomic number 33 Clip
Atomic / Molecular Weight 74.9216 gmol-1Clip
Density 5776 kgm-3Clip
Crystal Structure Rhombohedral Clip
Lattice constant 413 fmClip
Photo-electric work function 5.1 eVClip
Melting Point 883 KClip
Specific heat capacity 326 Jkg-1K-1Clip
Bulk Modulus of Rigidity 22000000000 Nm-2Clip
Electromotive Series -0.3 VClip
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See also: Arsenic III Oxide, Arsenic V Oxide, Periodic Table.

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Subjects: Chemistry


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