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Chemical Properties of Protactinium and Tantalum

Protactinium
Tantalum
Chemical Properties of Tantalum and Protactinium


Chemical Properties
Chemical Formula
Pa   
Ta   
Isotopes
  
  
Known Isotopes
27   
12
31   
8
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.50   
27
Allred Rochow Electronegativity
1.14   
28
1.33   
22
Allen Electronegativity
Not Available   
1.34   
33
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.50   
27
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
761.00 kJ/mol   
18
2nd Energy Level
1,128.00 kJ/mol   
99+
1,500.00 kJ/mol   
40
3rd Energy Level
1,814.00 kJ/mol   
99+
Not Available   
4th Energy Level
2,991.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.72 g/amp-hr   
99+
1.35 g/amp-hr   
99+
Electron Work Function
Not Available   
4.25 eV   
21
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
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