Protactinium

Pa Protactinium Rare Earth

 

Atomic number:  91 Atomic weight:  231.03588
Shells:  2,8,18,32,20,9,2 Orbitals:  [Rn] 5f2 6d1 7s2
Melting point:  1600°C Boiling point:  --
Covalent radius:  -- Å Atomic volume:  15.0 cm³/mol
Atomic radius:  -- Å Ionic radius:  -- Å
Electronegativity:  1.5 Oxidation states:  (5),4
1st ionization pot.:  5.89 V 2nd ionization pot.:  -- V
3rd ionization pot.:  -- V Specific heat:  0.12 J/gK
Heat of fusion:  12.30 kJ/mol Heat of vapor.:  -- kJ/mol
Thermal conduct.:  0.47 W/cmK Electrical conduct.:  0.0529 10^6/cm ohm
Density:  15.4 g/cm³ Valence:  4,5