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helium
Helium Informationen, einschließlich Technische Daten, Safety Data und seine Eigenschaften, Forschung, Anwendungen und andere nützliche Fakten sind erörtert werden. Wissenschaftliche Fakten, wie die atomare Struktur, Ionisierungenergie, Fülle auf der Erde, Leitfähigkeit und thermischen Eigenschaften sind im Preis inbegriffen.
 

 

  Hydrogen                                 Helium
  Lithium Beryllium                     Boron Carbon Nitrogen Oxygen Fluorine Neon
  Sodium Magnesium                     Aluminum Silicon Phosphorus Sulfur Chlorine Argon
  Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Hydrogen Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
  Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
  Cesium Barium Cerium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury Thallium Lead Bismuth Polonium Astatine Radon
                                     
      Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium    
      Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawerencium    


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Helium ist ein Block S, Gruppe 18, Periode 1 Element. Die elektronische Konfiguration 1s2

Helium wurde von Pierre Jules César Janssen und Sir William Ramsay im Jahre 1868.

 

 

French Hélium German Helium Italian Elio Portuguese Hélio Spanish Helio Swedish Helium

Helium Abundance. The following table shows the abundance of helium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope.

Isotope
Atomic Mass
% Abundance on Earth
He-3
3.016029310
0.01
He-4
4.002603250
99.99

Helium Safety Data. The safety data for helium metal, nanoparticles and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the left margin.

Ionisation Energie. Die Ionisierungenergie für helium (die am wenigsten Energie benötigt, um ein einzelnes Elektron aus dem Atom in seinem Grundzustand in der Gasphase) ist in der folgenden Tabelle dargestellt:

1st Ionization Energy
708.58 kJ mol-1
2nd Ionization Energy
1411.81 kJ mol-1
3rd Ionization Energy
2943.07 kJ mol-1

Conductivity. As to helium's electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @ 20 ºC is - µOcm and its electronegativities (or its ability to draw electrons relative to other elements) is -. The thermal conductivity of helium is 0.155 W m-1 K-1.

Thermal Properties of Helium. The melting point and boiling point for helium are stated below. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization.

Heat of Fusion
0.021 kJ mol-1
Heat of Vaporization
0.082 kJ mol-1
Heat of Atomization
0 kJ mol-1



 
Formula Atomic Number Molecular Weight Electronegativity (Pauling) Density Melting Point
Boiling Point
Vanderwaals radius
Ionic radius Energy of first ionization
He 2 4.002602 g.mol -1 - 0.08988 g.cm-3 -272.2 °C -268.93 °C .120 nm 128pm 708.58 kJ.mol-1

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Recent Research & Development for Helium

  • Formation and properties of metal clusters isolated in helium droplets.
    Phys Chem Chem Phys. 2007 Sep 14;9(34):4748-70. Epub 2007 Jul 12. [PubMed - in process]

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  • Photoreduction of the active site of the metalloprotein putidaredoxin by synchrotron radiation.
    Acta Crystallogr D Biol Crystallogr. 2007 Sep;63(Pt 9):951-60. Epub 2007 Aug 17. [PubMed - in process]

  • [Analysis of supercritical fluid extracts of Radix caulophylli with gas chromatography-mass spectrometry]
    Yao Xue Xue Bao. 2007 May;42(5):525-8. Chinese. PMID: 17703777 [PubMed - in process]

  • Measurement of functional residual capacity by helium dilution during partial support ventilation: in vitro accuracy and in vivo precision of the method.
    Intensive Care Med. 2007 Aug 17; [Epub ahead of print] PMID: 17703280 [PubMed - as supplied by publisher]

  • Charging of metal clusters in helium droplets exposed to intense femtosecond laser pulses.
    Phys Chem Chem Phys. 2007 Sep 7;9(33):4639-52. Epub 2007 Jul 13. [PubMed - in process]

  • Hydrocarbon-free resonance transition 795-nm rubidium laser.
    Opt Lett. 2007 Aug 15;32(16):2423-5. [PubMed - in process]

  • Heavy Water Reactions with Atomic Transition-Metal and Main-Group Cations: Gas Phase Room-Temperature Kinetics and Periodicities in Reactivity.
    J Phys Chem A. 2007 Aug 16; [Epub ahead of print] [PubMed - as supplied by publisher]

  • Impact studies of high-speed micro-particles following biolistic delivery.
    IEEE Trans Biomed Eng. 2007 Aug;54(8):1507-13. [PubMed - in process]

  • Bioorg Chem. 2007 Aug 17.

 

 

 

 

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