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Pm   -   Promethium (61/144.913)

Material List
Currently compound materials are not available.
  • Naturally occurring isotopes: None
  • Density: 7.22 ± 0.02 (298.15K) g/cm3
  • Melting point: 1168 ± 6 oC
  • Boiling point: 2460 oC
  • Latent heat of fusion: 86.7 J/g
  • Specific heat: 0.185 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: cm/cm/K (at room temp.)
  • Thermal conductivity: 1.79E-01 W/cm/K (at room temp.)
  • Electrical resistivity: hm-cm (at room temp.)
  • lonization potential (1st): 5.55 eV
  • Electronic work function Φ:
  • Oxidation potentials: Pm → Pm3+ + 3e = 2.423 V
  • Chemical valence: 3
  • Electrochemical equivalents: 1.8022 g/amp-hr
  • lonic radius: 0.979 angstrom
  • Valence electron potential: 44.1 -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 4f5 5s2 5p6 6s2
  • Valence electrons: 4f5 6s2
  • Crystal form: Hexagonal
  • Half life: 17.7 years
  • Cross section σ: barns
  • Vapor pressure: Pa (at melting point)