Symbol:
He
Atomic Number: 2
Boiling Point: 4.216K
Melting Point: 0.95K
Density at 300K: 0.1785 g/cm
3
Covalent radius: 0.93
Atomic radius: 0.49
Atomic
volume: 31.80 cm
3/mol
First
ionization potental: 24.587 V
Specific heat capacity: 5.193 Jg
-1K
-1
Thermal conductivity: 0.152Wm
-1K
-1
Electrical conductivity: N/A
Heat of fusion: 0.021 kJ/mol
Heat of vaporization: 0.084 kJ/mol
Electronegativity: N/A