Color: colorless
State at 25°C: gas
Density (g/cm3): 0.0014
Hardness (Mohs): No data
Melting Point (K): 54.8
Boiling Point (K): 90.2
Heat of Fusion (kJ/mol): 0.4
Heat of Vaporization (kJ/mol): No data
Heat of Atomization (kJ/mol): 249
Therm. Conductivity (J/m sec K): 0.03
Elec. Conductivity (1/mohm cm): 0
Abundance, Solar System: 7.377
Abundance, Earth's Crust: 5.7
Pure Cost ($/100g): $ 0.30
Bulk Cost ($/100g):  
Source: Air