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Chemical Properties of Samarium and Promethium

Samarium
Promethium
Chemical Properties of Promethium and Samarium


Chemical Properties
Chemical Formula
Sm   
Pm   
Isotopes
  
  
Known Isotopes
30   
9
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.17   
40
Not Available   
Allred Rochow Electronegativity
1.07   
32
1.07   
32
Electropositivity
  
  
Pauling Electropositivity
2.83   
14
Not Available   
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol   
99+
540.00 kJ/mol   
99+
2nd Energy Level
1,070.00 kJ/mol   
99+
1,050.00 kJ/mol   
99+
3rd Energy Level
2,260.00 kJ/mol   
99+
2,150.00 kJ/mol   
99+
4th Energy Level
3,990.00 kJ/mol   
37
3,970.00 kJ/mol   
38
Electrochemical Equivalent
1.87 g/amp-hr   
34
1.80 g/amp-hr   
36
Electron Work Function
2.70 eV   
99+
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes   
Ionization, Radioactive Isotopes, Solubility   
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