Neptunium

Np Neptunium Rare Earth

 

Atomic number:  93 Atomic weight:  (237.0482)
Shells:  2,8,18,32,22,9,2 Orbitals:  [Rn] 5f4 6d1 7s2
Melting point:  640°C Boiling point:  3902°C
Covalent radius:  -- Å Atomic volume:  11.62 cm³/mol
Atomic radius:  -- Å Ionic radius:  -- Å
Electronegativity:  1.36 Oxidation states:  6,(5),4,3
1st ionization pot.:  6.2657 V 2nd ionization pot.:  -- V
3rd ionization pot.:  -- V Specific heat:  0.12 J/gK
Heat of fusion:  5.190 kJ/mol Heat of vapor.:  -- kJ/mol
Thermal conduct.:  0.063 W/cmK Electrical conduct.:  0.00822 10^6/cm ohm
Density:  20.45 g/cm³ Valence:  3,4,5,6