Thorium

Th Thorium Rare Earth

 

Atomic number:  90 Atomic weight:  232.0381
Shells:  2,8,18,32,18,10,2 Orbitals:  [Rn] 6d2 7s2
Melting point:  1750°C Boiling point:  4000°C
Covalent radius:  1.65 Å Atomic volume:  19.9 cm³/mol
Atomic radius:  -- Å Ionic radius:  1.05 (+4) Å
Electronegativity:  1.3 Oxidation states:  
1st ionization pot.:  6.08 V 2nd ionization pot.:  11.504 V
3rd ionization pot.:  20.003 V Specific heat:  0.12 J/gK
Heat of fusion:  16.10 kJ/mol Heat of vapor.:  514.40 kJ/mol
Thermal conduct.:  0.540 W/cmK Electrical conduct.:  0.0653 10^6/cm ohm
Density:  11.7 g/cm³ Valence:  4