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Se   -   Selenium (34/78.96)

Material List
  • Naturally occurring isotopes: 80 78 82 76 77 74
  • Density: 4.792 (gray)(293.15K) g/cm3
  • Melting point: 217 (gray) oC
  • Boiling point: 684.9 ± 1.0 oC
  • Latent heat of fusion: 68.93 J/g
  • Specific heat: 0.1606 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: 3.68E+01 cm/cm/K (at room temp.)
  • Thermal conductivity: 4.52E-02 (at 25C) W/cm/K (at room temp.)
  • Electrical resistivity: 1.00E+00 hm-cm (at room temp.)
  • lonization potential (1st): 9.752 eV
  • Electronic work function Φ: 5.9
  • Oxidation potentials: Se + 3H2O → H2SeO3 + 4H+ + 4e = -0.740 V
  • Chemical valence: -2 4 6
  • Electrochemical equivalents: 0.7365 g/amp-hr
  • lonic radius: 0.5 (Se4+) angstrom
  • Valence electron potential: 120 -eV
  • Principal quantum number: 4
  • Principal electron shells: K L M N
  • Electronic configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
  • Valence electrons: 4s2 4p4
  • Crystal form: Hexagonal Monoclinic Amorphous
  • Half life:
  • Cross section σ: 12.2 ± 0.6 barns
  • Vapor pressure: Pa (at melting point)