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Chemical Properties of Tantalum and Promethium

Tantalum
Promethium
Chemical Properties of Promethium and Tantalum


Chemical Properties
Chemical Formula
Ta   
Pm   
Isotopes
  
  
Known Isotopes
31   
8
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
Not Available   
Allred Rochow Electronegativity
1.33   
22
1.07   
32
Allen Electronegativity
1.34   
33
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
Not Available   
Ionization Energies
  
  
1st Energy Level
761.00 kJ/mol   
18
540.00 kJ/mol   
99+
2nd Energy Level
1,500.00 kJ/mol   
40
1,050.00 kJ/mol   
99+
3rd Energy Level
Not Available   
2,150.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,970.00 kJ/mol   
38
Electrochemical Equivalent
1.35 g/amp-hr   
99+
1.80 g/amp-hr   
36
Electron Work Function
4.25 eV   
21
Not Available   
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Solubility   
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