| 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) |