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Chemical Properties of Promethium and Hafnium

Promethium
Hafnium
Chemical Properties of Hafnium and Promethium


Chemical Properties
Chemical Formula
Pm   
Hf   
Isotopes
  
  
Known Isotopes
27   
12
32   
7
Electronegativity
  
  
Pauling Electronegativity
Not Available   
1.30   
32
Allred Rochow Electronegativity
1.07   
32
1.23   
25
Allen Electronegativity
Not Available   
1.16   
37
Electropositivity
  
  
Pauling Electropositivity
Not Available   
2.70   
22
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol   
99+
658.50 kJ/mol   
40
2nd Energy Level
1,050.00 kJ/mol   
99+
1,440.00 kJ/mol   
99+
3rd Energy Level
2,150.00 kJ/mol   
99+
2,250.00 kJ/mol   
99+
4th Energy Level
3,970.00 kJ/mol   
38
3,216.00 kJ/mol   
99+
Electrochemical Equivalent
1.80 g/amp-hr   
36
1.66 g/amp-hr   
99+
Electron Work Function
Not Available   
3.90 eV   
27
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
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