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Chemical Properties of Protactinium and Samarium

Protactinium
Samarium
Chemical Properties of Samarium and Protactinium


Chemical Properties
Chemical Formula
Pa   
Sm   
Isotopes
  
  
Known Isotopes
27   
12
30   
9
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
1.17   
40
Allred Rochow Electronegativity
1.14   
28
1.07   
32
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
2.83   
14
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
544.50 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,070.00 kJ/mol   
99+
3rd Energy Level
1,814.00 kJ/mol   
99+
2,260.00 kJ/mol   
99+
4th Energy Level
2,991.00 kJ/mol   
99+
3,990.00 kJ/mol   
37
Electrochemical Equivalent
1.72 g/amp-hr   
99+
1.87 g/amp-hr   
34
Electron Work Function
Not Available   
2.70 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes   
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