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Np   -   Neptunium (93/237.048)

Material List
  • Naturally occurring isotopes: None
  • Density: 20.45 (298.15K) g/cm3
  • Melting point: 640 ± 1 oC
  • Boiling point: 3902 oC
  • Latent heat of fusion: 46 J/g
  • Specific heat: J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: cm/cm/K (at room temp.)
  • Thermal conductivity: 6.30E-02 W/cm/K (at room temp.)
  • Electrical resistivity: 1.19E-04 hm-cm (at room temp.)
  • lonization potential (1st): 6.19 eV
  • Electronic work function Φ:
  • Oxidation potentials: Np → Np3+ + 3e = 1.856 V
  • Chemical valence: 3 4 5 6 7
  • Electrochemical equivalents: 1.7689 g/amp-hr
  • lonic radius: 0.75 angstrom
  • Valence electron potential: 96 -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 5f4 6s2 6p6 6d1 7s2
  • Valence electrons: 5f4 6d1 7s2
  • Crystal form: Orthorhombic
  • Half life: 2.14E4 years
  • Cross section σ: 170 ± 5 barns
  • Vapor pressure: Pa (at melting point)