Color: colorless
State at 25°C: gas
Density (g/cm3): 0.0097
Hardness (Mohs): No data
Melting Point (K): 202.2
Boiling Point (K): 211
Heat of Fusion (kJ/mol): No data
Heat of Vaporization (kJ/mol): 18.1
Heat of Atomization (kJ/mol): 0
Therm. Conductivity (J/m sec K): 0
Elec. Conductivity (1/mohm cm): 0
Abundance, Solar System: No data
Abundance, Earth's Crust: -12.4
Pure Cost ($/100g):  
Bulk Cost ($/100g):  
Source: Synthetic (Ra-226 decay)