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Arsen (As)

Ordnungszahl: 33
Name: Arsenic
Namensursprung: Greek: arsenikon; Latin: arsenicum, (both names for yellow pigment).
Entdeckung: Known to the ancients.
Beschreibung: Steel-gray, brittle semi-metal.
Vorkommen: Found in mispickel (arsenopyrite)
Verwendung: Many of its compounds are deadly poison and used as weed killer and rat poison. Conducts electricity. Used in semiconductors. Some compounds, called arsenides, are used in the manufacture of paints, wallpapers, and ceramics.
Gruppe: Non-Metal
Atomgewicht: 74.92159
Schmelzpunkt: 817°C at 28 atmos.
Siedepunkt: Sublimes at 613°C
Dichte bei 293 K: 5.72 g/cm³
Aggregatszustand bei Raumtemperatur: Not Available
Schalen: 2,8,18,5
Orbitale: [Ar] 3d10 4s2 4p3
Valenzen: -3,0,3,5
1. Ionisierungs- potential: 9.8152 V
2. Ionisierungs- potential: 18.633 V
3. Ionisierungs- potential: 28.351 V
Atomradius: 1.33 Å
Spezifische Wärme: 0.33 J/gK
Verdampfungswärme: 34.760 kJ/mol
Schmelzwärme: --
Thermischer Ausdehnungskoeffizient: 15.4 10-6 K-1
Röntgenemission Energie / Wellenlänge:
  KA KB LA LB MA MB      
eV 10532.1 11726.6 1282.05 1317.02 0 0      
Å 1.17721 1.0573 9.67087 9.41409 0 0      
Röntgenabsorption Energie / Wellenlänge:
  K L-I L-II L-III M-I M-II M-III M-IV M-V
eV 11867 1527 1359 1324 0 0 0 0 0
Å 1.04479 8.11954 9.12328 9.36446 0 0 0 0 0
Röntgen Fluoreszenz Ausbeute:
  KA KB LA LB MA MB      
  56.8% 0% 1.2% 0% 0% 0%      
Nuklide:
  Anteil Gewicht Spin Halbwertszeit Zerfallsmodus
As71 0% 71 5/2 2.72d EC,β+
As72 0% 72 2 26.0h β+,EC
As73 0% 73 3/2 80.3d EC
As74 0% 73.924 2 17.78d EC,β+,β-
As75 100% 74.9216 3/2   Stable
As76 0% 75.922 2 26.3h β-
As77 0% 76.921 3/2 38.8h β-


book | by Dr. Radut