| Quantity | Value | Units | Value | Units |
| Atomic number | 5 | |||
| Atomic mass | 10.81(7) | g mole-1 | ||
| Specific gravity | 2.370 | g cm-3 | ||
| Mean excitation energy | 76.0 | eV | ||
| Minimum ionization | 1.623 | MeV g-1cm2 | 3.847 | MeV cm-1 |
| Nuclear collision length | 58.0 | g cm-2 | 24.47 | cm |
| Nuclear interaction length | 83.3 | g cm-2 | 35.16 | cm |
| Pion collision length | 85.2 | g cm-2 | 35.96 | cm |
| Pion interaction length | 115.5 | g cm-2 | 48.75 | cm |
| Radiation length | 52.68 | g cm-2 | 22.23 | cm |
| Critical energy | 93.94 | MeV (for e-) | 91.40 | MeV (for e+) |
| Molière radius | 11.89 | g cm-2 | 5.018 | cm |
| Plasma energy ℏωp | 30.17 | eV | ||
| Muon critical energy | 1170. | GeV |