Arsen

33
As
Gruppe
15
Periode
4
Block
p
Protonen
Elektronen
Neutronen
33
33
42
Generelle Eigenschaften
Ordnungszahl
33
Atommasse
74,9216
Massenzahl
75
Kategorie
Halbmetalle
Farbe
Silber
Radioaktiv
Nein
Aus dem Lateinischen arsenicum, Griechisch arsenikon
Kristallstruktur
Einfach Trigonal
Geschichte
Greek historian Olympiodorus of Thebes roasted arsenic sulfide and obtained white arsenic during 5th century AD.

Albertus Magnus is believed to have been the first to isolate the element from a compound in 1250, by heating soap together with arsenic trisulfide.

In 1649, Johann Schröder published two ways of preparing arsenic.
Elektronen pro Schale
2, 8, 18, 5
Elektronenkonfiguration
[Ar] 3d10 4s2 4p3
As
Prawns are known to contain quite high levels of arsenic
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
5,776 g/cm3
Schmelzpunkt
1090,15 K | 817 °C | 1502,6 °F
Siedepunkt
876,15 K | 603 °C | 1117,4 °F
Schmelzwärme
27,7 kJ/mol
Verdampfungswärme
32,4 kJ/mol
Spezifische Wärmekapazität
0,329 J/g·K
Häufigkeit in der Erdkruste
0,00021%
Häufigkeit im Universum
8×10-7%
Ultrapure
Danksagungen für Bilder: Images-of-elements
Ultrapure metallic arsenic under argon
CAS-Nummer
7440-38-2
PubChem CID Number
5359596
Atomeigenschaften
Atomradius
119 pm
Kovalenter Radius
119 pm
Elektronegativität
2,18 (Pauling-Skala)
Ionisierungsenergie
9,7886 eV
Molares Volumen
12,97 cm3/mol
Wärmeleitfähigkeit
0,502 W/cm·K
Oxidationszustände
-3, 2, 3, 5
Anwendung
The toxicity of arsenic to insects, bacteria and fungi led to its use as a wood preservative and as insecticides.

Arsenic is used in bronzing, pyrotechny, and for hardening and improving the sphericity of shot.

Gallium arsenide is a semiconductor used in laser diodes and LEDs.

Small amounts of arsenic can be used in lead alloys for ammunition.
Arsenic and its compounds are poisonous
Isotope
Stabile Isotope
75As
Instabile Isotope
60As, 61As, 62As, 63As, 64As, 65As, 66As, 67As, 68As, 69As, 70As, 71As, 72As, 73As, 74As, 76As, 77As, 78As, 79As, 80As, 81As, 82As, 83As, 84As, 85As, 86As, 87As, 88As, 89As, 90As, 91As, 92As