| Quantity | Value | Units | Value | Units |
| Atomic number | 9 | |||
| Atomic mass | 18.998403163(6) | g mole-1 | ||
| Specific gravity | 1.507 | g cm-3 | ||
| Mean excitation energy | 115.0 | eV | ||
| Minimum ionization | 1.634 | MeV g-1cm2 | 2.462 | MeV cm-1 |
| Nuclear collision length | 65.0 | g cm-2 | 43.10 | cm |
| Nuclear interaction length | 97.4 | g cm-2 | 64.64 | cm |
| Pion collision length | 91.0 | g cm-2 | 60.40 | cm |
| Pion interaction length | 127.2 | g cm-2 | 84.43 | cm |
| Radiation length | 32.93 | g cm-2 | 21.85 | cm |
| Critical energy | 59.81 | MeV (for e-) | 58.17 | MeV (for e+) |
| Molière radius | 11.68 | g cm-2 | 7.748 | cm |
| Plasma energy ℏωp | 24.35 | eV | ||
| Muon critical energy | 811. | GeV | ||
| Melting point | 53.53 | K | -219.6 | C |
| Boiling point @ 1 atm | 85.03 | K | -188.1 | C |