eFunda: General Information on Element Neptunium
engineering fundamentals Element Information: Neptunium
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Neptunium
93
Np
[237]
Atomic Number 93
Atomic Weight [237]
Electron Config. 2-2-6-2-6-10-2-6-10-14-2-6-10-4-2-6-1-2
Electron configuration order: 1s-2s-2p-3s-3p-3d-4s-4p-4d-4f-5s-5p-5d-5f-6s-6p-6d-7s

Mechanical Properties Conditions
Phase Temp. (K) Pressure (Pa)
Density 20200 kg/m3 Solid  298.15 

Thermal Properties Conditions
Temp. (K) Pressure (Pa)
Melting Temperature 917.15 K   101325 
Boiling Temperature 4160 K   101325 
Critical Temperature 12000 K    
Thermal Conductivity 6.3 W/m-K 300 101325 

 
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