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Protactinium, Pa
Categories: Metal; Nonferrous Metal; Pure Element

Material Notes: Malleable and Ductile. Properties vary with isotope.

Physical Form: Shiny Metal; Tetragonal or Cubic

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Physical PropertiesMetricEnglishComments
Density 15.43 g/cc0.5574 lb/in³
 
Chemical PropertiesMetricEnglishComments
Atomic Mass 231.0359231.0359231.03588 - 1995
Atomic Number 9191
X-ray Absorption Edge 0.11028 Å0.11028 ÅK
 0.58748 Å0.58748 ÅLI
 0.61064 Å0.61064 ÅLII
 0.74138 Å0.74138 ÅLIII
Electronegativity 1.51.5Pauling
Ionic Radius 0.890 Å0.890 ÅCrystal Ionic Radius for Valence +5
 0.980 Å0.980 ÅCrystal Ionic Radius for Valence +4
 1.13 Å1.13 ÅCrystal Ionic Radius for Valence +3
 
Mechanical PropertiesMetricEnglishComments
Bulk Modulus 157 GPa22800 ksi
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000150 ohm-cm0.0000150 ohm-cm
Magnetic Susceptibility 190190emu/mol
Critical Superconducting Temperature 1.40 K1.40 K
 
Thermal PropertiesMetricEnglishComments
Heat of Fusion 12.3 J/g5.29 BTU/lb
CTE, linear 9.90 µm/m-°C
@Temperature 30.0 - 700 °C
5.50 µin/in-°F
@Temperature 86.0 - 1290 °F
Specific Heat Capacity 0.09912 J/g-°C0.02369 BTU/lb-°FGas
Thermal Conductivity 47.0 W/m-K326 BTU-in/hr-ft²-°F
Melting Point 1552 - 1592 °C2826 - 2898 °F
Heat of Formation 0.000 kJ/mol0.000 kJ/molCrystal
 607 kJ/mol607 kJ/molGas
 
Component Elements PropertiesMetricEnglishComments
Protactinium, Pa 100 %100 %
 
Descriptive Properties
CAS Number7440-73-3

References for this datasheet.

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