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Ra   -   Radium (88/226.025)

Material List
Ra (1)
1 material, 1 document(s) are retrieved.
  • Naturally occurring isotopes: 226 (minute quantities only)
  • Density: 5.5 (extrapolated)(293.15K) g/cm3
  • Melting point: 700 oC
  • Boiling point: 1140 oC
  • Latent heat of fusion: 37 J/g
  • Specific heat: 0.12 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: cm/cm/K (at room temp.)
  • Thermal conductivity: 0.00E+00 W/cm/K (at room temp.)
  • Electrical resistivity: 1.86E-01 hm-cm (at room temp.)
  • lonization potential (1st): 5.279 eV
  • Electronic work function Φ:
  • Oxidation potentials: Ra → Ra2+ + 2e = 2.916 V
  • Chemical valence: 2
  • Electrochemical equivalents: 4.2165 g/amp-hr
  • lonic radius: 1.43 angstrom
  • Valence electron potential: 20.1 -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 6s2 6p6 7s2
  • Valence electrons: 7s2
  • Crystal form:
  • Half life: 1622 years
  • Cross section σ: 20 ± 3 barns
  • Vapor pressure: 3.27E+02 Pa (at melting point)