Helium (He)
Atomic number
2
Mass number
4
Electronegativity
0.0
Covalent radius
0.93
Atomic radius
0.49
Melting point
0.95
Boiling point
4.215
Density
0.0001787
Specific heat
5.193
Electrical conductivity
0.0
Thermal conductivity
0.00152