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B   -   Boron (5/10.81)

Material List
  • Naturally occurring isotopes: 11 10
  • Density: 2.34(crystalline), 2.37(amorphous) (all at 293.15K) g/cm3
  • Melting point: 2300 oC
  • Boiling point: 2550 (sublimes) oC
  • Latent heat of fusion: 890.8 J/g
  • Specific heat: 1.03 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: 8.30E-06 cm/cm/K (at room temp.)
  • Thermal conductivity: 2.74E-01 W/cm/K (at room temp.)
  • Electrical resistivity: 1.80E+06 hm-cm (at room temp.)
  • lonization potential (1st): 8.298 eV
  • Electronic work function Φ: 4.45
  • Oxidation potentials: B + 3H2O → H3BO3 + 3H+ + 3e = -0.8698 V
  • Chemical valence: 3
  • Electrochemical equivalents: 0.1344 g/amp-hr
  • lonic radius: 0.23 angstrom
  • Valence electron potential: 190 -eV
  • Principal quantum number: 2
  • Principal electron shells: K L
  • Electronic configuration: 1s2 2s2 2p1
  • Valence electrons: 2s2 2p1
  • Crystal form: HCP
  • Half life:
  • Cross section σ: 759 barns
  • Vapor pressure: Pa (at melting point)