Promethium

Pm Promethium Rare Earth

 

Atomic number:  61 Atomic weight:  (144.9127)
Shells:  2,8,18,23,8,2 Orbitals:  [Xe] 4f5 6s2
Melting point:  1042°C Boiling point:  3000°C (estimated)
Covalent radius:  1.63 Å Atomic volume:  22.39 cm³/mol
Atomic radius:  2.62 Å Ionic radius:  1.09 (+3) Å
Electronegativity:  1.13 Oxidation states:  
1st ionization pot.:  5.55 V 2nd ionization pot.:  10.903 V
3rd ionization pot.:  22.283 V Specific heat:  0.18 J/gK
Heat of fusion:  -- kJ/mol Heat of vapor.:  -- kJ/mol
Thermal conduct.:  0.179 W/cmK Electrical conduct.:  -- 10^6/cm ohm
Density:  6.475 g/cm³ Valence:  3