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Ta   -   Tantalum (73/180.948)

Material List
  • Naturally occurring isotopes: 181 180
  • Density: 16.60 (293.15K) g/cm3
  • Melting point: 2996 oC
  • Boiling point: 5425 ± 100 oC
  • Latent heat of fusion: 174 J/g
  • Specific heat: 0.14 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: 6.50E-06 cm/cm/K (at room temp.)
  • Thermal conductivity: 5.75E-01 W/cm/K (at room temp.)
  • Electrical resistivity: 1.25E-05 hm-cm (at room temp.)
  • lonization potential (1st): 7.89 eV
  • Electronic work function Φ: 4.25
  • Oxidation potentials: 2Ta + 5H2O → Ta2O5 +10H+ + 10e = 0.812 V
  • Chemical valence: 3 4 5
  • Electrochemical equivalents: 1.3502 g/amp-hr
  • lonic radius: 0.64 angstrom
  • Valence electron potential: 110 -eV
  • Principal quantum number: 6
  • Principal electron shells: K L M N O P
  • Electronic configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d3 6s2
  • Valence electrons: 5d3 6s2
  • Crystal form: BCC
  • Half life:
  • Cross section σ: 22 ± 1 barns
  • Vapor pressure: 7.76E-01 Pa (at melting point)