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Master Bond adhesives

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Neptunium, Np
Categories: Metal; Nonferrous Metal; Pure Element

Material Notes: Np-237 is the most stable isotope.

Physical Form: Silver Metal

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Physical PropertiesOriginal ValueComments
Density 20.48 g/ccfrom X-ray data
 
Chemical PropertiesOriginal ValueComments
Atomic Mass 237Longest-Lived Isotope (1995)
Atomic Number 93
X-ray Absorption Edge 0.10487 ÅK
 0.55314 ÅLI
 0.57415 ÅLII
 0.70391 ÅLIII
Electronegativity 1.3Pauling
Ionic Radius 0.710 ÅCrystal Ionic Radius for Valence +7
 0.950 ÅCrystal Ionic Radius for Valence +4
 1.10 ÅCrystal Ionic Radius for Valence +3
 
Mechanical PropertiesOriginal ValueComments
Hardness, Vickers 346
Bulk Modulus 118 GPa
Shear Modulus 80.0 GPa
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.000164 ohm-cm
 
Thermal PropertiesOriginal ValueComments
Heat of Fusion 22.1 J/g
CTE, linear 27.5 µm/m-°C
@Temperature 40.0 - 240 °C
Alpha Phase
 41.0 µm/m-°C
@Temperature 278 - 530 °C
Beta Phase
Specific Heat Capacity 0.125 J/g-°CQuestionable Value
Melting Point 637 °C
 
Component Elements PropertiesOriginal ValueComments
Neptunium, Np 100 %
 
Descriptive Properties
CAS Number7439-99-8
SolubilitySoluble in HCl

References for this datasheet.

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