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Chemical Properties of Protactinium and Hafnium

Protactinium
Hafnium
Chemical Properties of Hafnium and Protactinium


Chemical Properties
Chemical Formula
Pa   
Hf   
Isotopes
  
  
Known Isotopes
27   
12
32   
7
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.30   
32
Allred Rochow Electronegativity
1.14   
28
1.23   
25
Allen Electronegativity
Not Available   
1.16   
37
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.70   
22
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
658.50 kJ/mol   
40
2nd Energy Level
1,128.00 kJ/mol   
99+
1,440.00 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
2,250.00 kJ/mol   
99+
4th Energy Level
2,991.00 kJ/mol   
99+
3,216.00 kJ/mol   
99+
Electrochemical Equivalent
1.72 g/amp-hr   
99+
1.66 g/amp-hr   
99+
Electron Work Function
Not Available   
3.90 eV   
27
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
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