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Pa   -   Protactinium (91/231.036)

Material List
Pa (5)
1 material, 5 document(s) are retrieved.
  • Naturally occurring isotopes: 231 (minute quantities only)
  • Density: 15.37 (298.15K) g/cm3
  • Melting point: 1575 oC
  • Boiling point: oC
  • Latent heat of fusion: 65 J/g
  • Specific heat: 0.12 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: 1.12E-05 cm/cm/K (at room temp.)
  • Thermal conductivity: W/cm/K (at room temp.)
  • Electrical resistivity: hm-cm (at room temp.)
  • lonization potential (1st): 5.89 eV
  • Electronic work function Φ:
  • Oxidation potentials: Pa → Pa3+ + 3e = 1.6 V
  • Chemical valence: 3 4 5
  • Electrochemical equivalents: 1.724 g/amp-hr
  • lonic radius: 0.78 angstrom
  • Valence electron potential: 92 -eV
  • Principal quantum number: 7
  • Principal electron shells: K L M N O P Q
  • Electronic configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f2 6s2 6p6 6d1 7s2
  • Valence electrons: 5f2 6d1 7s2
  • Crystal form: Tetragonal
  • Half life: 3.248E4 years
  • Cross section σ: 200 ± 10 barns
  • Vapor pressure: Pa (at melting point)