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Ac   -   Actinium (89/227)

Material List
Currently compound materials are not available.
  • Naturally occurring isotopes: 227 (minute quantities only)
  • Density: 10.07 (298.15K) g/cm3
  • Melting point: 1100 ± 50 oC
  • Boiling point: 3200 ± 300 (est) oC
  • Latent heat of fusion: 62 J/g
  • Specific heat: .012 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: cm/cm/K (at room temp.)
  • Thermal conductivity: .012 W/cm/K (at room temp.)
  • Electrical resistivity: hm-cm (at room temp.)
  • lonization potential (1st): 5.17 eV
  • Electronic work function Φ:
  • Oxidation potentials: Ac → Ac3+ + 3e = 2.2 V
  • Chemical valence: 3
  • Electrochemical equivalents: 2.82347 g/amp-hr
  • lonic radius: 1.19 (Ac3+ angstrom
  • Valence electron potential: 38.60 (Ac3+) -eV
  • Principal quantum number: 7
  • Principal electron shells: K L M N O P Q
  • Electronic configuration: 1s2 2s2 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 6d1 7s2
  • Valence electrons: 6d1 7s2
  • Crystal form: FCC
  • Half life: 21.77 years
  • Cross section σ: 810 ± 20 barns
  • Vapor pressure: Pa (at melting point)