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Krypton (Kr)

Ordnungszahl: 36
Name: Krypton
Namensursprung: Greek: kryptos (hidden).
Entdeckung: 1898 by Sir William Ramsey, M.W. Travers in Great Britain
Beschreibung: Colorless, odorless, tasteless rare noble gas.
Vorkommen: Forms 1 millionth of the atmosphere. Obtained from production of liquid air.
Verwendung: Used in lighting products. Some is used as inert filler-gas in incandescent bulbs. Some is mixed with argon in fluorescent lamps. The most important use is in flashing stroboscopic lamps that outline airport runways.
Gruppe: Noble Gas
Atomgewicht: 83.80
Schmelzpunkt: -156.6°C
Siedepunkt: -152.3°C
Dichte bei 293 K: 0.003708 g/cm³
Aggregatszustand bei Raumtemperatur: Gas
Schalen: 2,8,18,8
Orbitale: [Ar] 3d10 4s2 4p6
Valenzen: 0
1. Ionisierungs- potential: 13.9996 V
2. Ionisierungs- potential: 24.359 V
3. Ionisierungs- potential: 36.95 V
Atomradius: 1.03 Å
Spezifische Wärme: 0.248 J/gK
Verdampfungswärme: 9.029 kJ/mol
Schmelzwärme: 1.638 kJ/mol
Thermischer Ausdehnungskoeffizient: 425 10-6 K-1
Röntgenemission Energie / Wellenlänge:
  KA KB LA LB MA MB      
eV 12633.1 14113.3 1586.1 1636.56 0 0      
Å 0.98143 0.8785 7.817 7.57598 0 0      
Röntgenabsorption Energie / Wellenlänge:
  K L-I L-II L-III M-I M-II M-III M-IV M-V
eV 14326 1921 1728 1675 0 0 0 95.04 93.83
Å 0.86545 6.45421 7.17508 7.40211 0 0 0 130.456 132.138
Röntgen Fluoreszenz Ausbeute:
  KA KB LA LB MA MB      
  64.6% 0% 1.9% 0% 0% 0%      
Nuklide:
  Anteil Gewicht Spin Halbwertszeit Zerfallsmodus
Kr78 0.35% 77.9204 0   Stable
Kr79 0% 79 1/2 1.45d EC,β+
Kr80 2.27% 79.9164 0   Stable
Kr81 0% 80.917 7/2 2.1E05y EC
Kr82 11.56% 81.9135 0   Stable
Kr83 11.55% 82.9141 9/2   Stable
Kr83m 0% 83 1/2 1.86h IT
Kr84 56.9% 83.9115 0   Stable
Kr85 0% 84.913 9/2 10.73y β-
Kr85m 0% 85 1/2 4.48h β-,IT
Kr86 17.37% 85.9106 0   Stable
Kr87 0% 87 5/2 1.27h β-
Kr88 0% 88 0 2.84h β-
Kr89 0% 89 0 3.15m β-
Kr90 0% 90 0 32.3s β-,β-


book | by Dr. Radut