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Home > Art, Film & Photography > Edelgas: Edelgase, Helium, Argon, Neon, Krypton, Xenon, Ununoctium, Radon
Edelgas: Edelgase, Helium, Argon, Neon, Krypton, Xenon, Ununoctium, Radon

Edelgas: Edelgase, Helium, Argon, Neon, Krypton, Xenon, Ununoctium, Radon


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About the Book

Dieser Inhalt ist eine Zusammensetzung von Artikeln aus der frei verfugbaren Wikipedia-Enzyklopadie. Seiten: 27. Nicht dargestellt. Kapitel: Edelgase, Helium, Argon, Neon, Krypton, Xenon, Ununoctium, Radon. Auszug: Helium (altgr. Sonne") ist ein chemisches Element mit dem Elementsymbol He und der Ordnungszahl 2. Im Periodensystem steht es in der 18. Gruppe (fruher 8. Hauptgruppe) und zahlt damit zu den Edelgasen. Es ist ein farbloses, geruchloses, geschmacksneutrales, ungiftiges Gas. Helium bleibt bis zu sehr tiefen Temperaturen gasformig, erst nahe dem absoluten Nullpunkt wird es flussig. Es ist die einzige Substanz, die bei Normaldruck selbst am absoluten Nullpunkt (0 K bzw. 273,15 C) nicht fest wird. Helium ist die Substanz mit der grossten bekannten chemischen Reaktionstragheit. Auch unter Extrembedingungen konnten bis jetzt keine Verbindungen des Heliums nachgewiesen werden, die nicht sofort nach der Bildung zerfallen. Soweit bekannt, kommt Helium nur atomar vor. Das haufigste stabile Isotop ist He; ein weiteres stabiles Isotop ist das sehr seltene He. Das Verhalten der beiden flussigen Phasen Helium I rsp. Helium-I sowie Helium II bzw. Helium-II (insbesondere das Phanomen der Suprafluiditat) von He ist Gegenstand aktueller Forschungen auf dem Gebiet der Quantenmechanik. Weiterhin ist flussiges Helium ein unverzichtbares Hilfsmittel zur Erzielung der tiefsten Temperaturen, die unter anderem zur Kuhlung von Infrarotdetektoren von Weltraumteleskopen und zur Untersuchung von Eigenschaften wie zum Beispiel der Supraleitung von Materie bei Temperaturen nahe dem absoluten Nullpunkt erforderlich sind. Helium ist, nach Wasserstoff, das zweithaufigste Element im Universum. Nach anerkannter Theorie vereinigten sich 10 Sekunden nach dem Urknall Protonen und Neutronen durch Kernfusion zu ersten Atomkernen. Aus deren gesamter Masse bildeten sich dabei unter anderem 25 % He und 0,001 % Deuterium, sowie Spuren von He. Somit ist der grosste Teil Helium schon beim Urknall .


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Product Details
  • ISBN-13: 9781158942381
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Weight: 68 gr
  • ISBN-10: 1158942389
  • Publisher Date: 27 Aug 2011
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Sub Title: Edelgase, Helium, Argon, Neon, Krypton, Xenon, Ununoctium, Radon
  • Width: 189 mm


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