Color: colorless
State at 25°C: gas
Density (g/cm3): 0.0018
Hardness (Mohs): No data
Melting Point (K): 84
Boiling Point (K): 87.3
Heat of Fusion (kJ/mol): 1.2
Heat of Vaporization (kJ/mol): 6.5
Heat of Atomization (kJ/mol): 0
Therm. Conductivity (J/m sec K): 0.02
Elec. Conductivity (1/mohm cm): 0
Abundance, Solar System: 5.004
Abundance, Earth's Crust: 0.5
Pure Cost ($/100g): $ 0.50
Bulk Cost ($/100g):  
Source: Air