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Helium
2
He
4.0026
Atomic Number 2
Atomic Weight 4.0026
Electron Config. 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 0.1785 kg/m3 Gas  293.15  101325 
Density 124.901 kg/m3 Liquid  4.2221  101325 

Thermal Properties Conditions
Temp. (K) Pressure (Pa)
Melting Temperature 3.5 K   101325 
Boiling Temperature 4.22 K   101325 
Critical Temperature 5.19 K    
Fusion Enthalpy 2.1 J/g 101325 
Vaporization Enthalpy 20.71 J/g 101325 
Heat Capacity 5193 J/kg-K 298.149993896 100000 
 
Glossary