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Mangan (Mn)

Ordnungszahl: 25
Name: Manganese
Namensursprung: Latin: magnes (magnet); Italian: manganese.
Entdeckung: 1774 by Johann Gahn in Sweden
Beschreibung: Hard, brittle, gray-white metal with a pinkish tinge. Rusts like iron in moist air.
Vorkommen: Abundant ores are pyrolusite (MnO2), psilomelane [(Ba,H2O)2Mn5O10] and rhodochrosite (MnCO3). Pure metal produced by mixing MnO2 with powered Al and ignited in a furnace.
Verwendung: Used in steel, batteries and ceramics. The steel in railroad tracks can contain as much as 1.2% manganese. It is crucial to the effectiveness of vitamin B1.
Gruppe: Transition Metal
Atomgewicht: 54.93805
Schmelzpunkt: 1244°C
Siedepunkt: 2061°C
Dichte bei 293 K: 7.43 g/cm³
Aggregatszustand bei Raumtemperatur: Solid
Schalen: 2,8,13,2
Orbitale: [Ar] 3d5 4s2
Valenzen: 1,2,3,4,6,7
1. Ionisierungs- potential: 7.4340 V
2. Ionisierungs- potential: 15.64 V
3. Ionisierungs- potential: 33.667 V
Atomradius: 1.79 Å
Spezifische Wärme: 0.48 J/gK
Verdampfungswärme: 226.0 kJ/mol
Schmelzwärme: 12.050 kJ/mol
Thermischer Ausdehnungskoeffizient: 21.7 10-6 K-1
Röntgenemission Energie / Wellenlänge:
  KA KB LA LB MA MB      
eV 5895.25 6490.67 637.457 648.799 0 0      
Å 2.10314 1.91021 19.45 19.11 0 0      
Röntgenabsorption Energie / Wellenlänge:
  K L-I L-II L-III M-I M-II M-III M-IV M-V
eV 6539 0 0 640 0 49.5 0 0 0
Å 1.89609 0 0 19.3727 0 250.476 0 0 0
Röntgen Fluoreszenz Ausbeute:
  KA KB LA LB MA MB      
  31.4% 0% 0.3% 0% 0% 0%      
Nuklide:
  Anteil Gewicht Spin Halbwertszeit Zerfallsmodus
Mn52 0% 52 6 5.591d EC,β+
Mn52m 0% 52 2 21.1m β+,EC,IT
Mn53 0% 52.9413 7/2 3.7E06y EC
Mn54 0% 53.9402 3 312.2d EC
Mn55 100% 54.938 5/2   Stable
Mn56 0% 56 3 2.578h β-
Mn57 0% 57 5/2 1.45m β-


book | by Dr. Radut