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Chemical Properties of Thorium and Protactinium

Thorium
Protactinium
Chemical Properties of Protactinium and Thorium


Chemical Properties
Chemical Formula
Th   
Pa   
Isotopes
  
  
Known Isotopes
28   
11
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.50   
27
Allred Rochow Electronegativity
1.11   
29
1.14   
28
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.50   
27
Ionization Energies
  
  
1st Energy Level
587.00 kJ/mol   
99+
568.00 kJ/mol   
99+
2nd Energy Level
1,110.00 kJ/mol   
99+
1,128.00 kJ/mol   
99+
3rd Energy Level
1,978.00 kJ/mol   
99+
1,814.00 kJ/mol   
99+
4th Energy Level
2,780.00 kJ/mol   
99+
2,991.00 kJ/mol   
99+
Electrochemical Equivalent
2.16 g/amp-hr   
24
1.72 g/amp-hr   
99+
Electron Work Function
3.41 eV   
32
Not Available   
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity   
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