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He   -   Helium (2/4.0026)

Material List
Currently compound materials are not available.
  • Naturally occurring isotopes: 4 3
  • Density: 0.17847E-03 (273.15K) g/cm3
  • Melting point: -272.2 oC
  • Boiling point: -268.934 oC
  • Latent heat of fusion: 5.23 J/g
  • Specific heat: 5.193 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: cm/cm/K (at room temp.)
  • Thermal conductivity: 1.52E-03 W/cm/K (at room temp.)
  • Electrical resistivity: hm-cm (at room temp.)
  • lonization potential (1st): 24.58 eV
  • Electronic work function Φ:
  • Oxidation potentials: V
  • Chemical valence: 0
  • Electrochemical equivalents: g/amp-hr
  • lonic radius: angstrom
  • Valence electron potential: -eV
  • Principal quantum number: 1
  • Principal electron shells: K
  • Electronic configuration: 1s2
  • Valence electrons: 1s2
  • Crystal form: HCP
  • Half life:
  • Cross section σ: 0.007 barns
  • Vapor pressure: Pa (at melting point)