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Chemical Properties of Erbium and Protactinium

Erbium
Protactinium
Chemical Properties of Protactinium and Erbium


Chemical Properties
Chemical Formula
Er   
Pa   
Isotopes
  
  
Known Isotopes
31   
8
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.24   
36
1.50   
27
Allred Rochow Electronegativity
1.11   
29
1.14   
28
Electropositivity
  
  
Pauling Electropositivity
2.76   
18
2.50   
27
Ionization Energies
  
  
1st Energy Level
589.30 kJ/mol   
99+
568.00 kJ/mol   
99+
2nd Energy Level
1,150.00 kJ/mol   
99+
1,128.00 kJ/mol   
99+
3rd Energy Level
2,194.00 kJ/mol   
99+
1,814.00 kJ/mol   
99+
4th Energy Level
4,120.00 kJ/mol   
33
2,991.00 kJ/mol   
99+
Electrochemical Equivalent
2.08 g/amp-hr   
28
1.72 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   
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