| Quantity | Value | Units | Value | Units |
| Atomic number | 15 | |||
| Atomic mass | 30.973761998(5) | g mole-1 | ||
| Specific gravity | 2.200 | g cm-3 | ||
| Mean excitation energy | 173.0 | eV | ||
| Minimum ionization | 1.613 | MeV g-1cm2 | 3.548 | MeV cm-1 |
| Nuclear collision length | 71.7 | g cm-2 | 32.59 | cm |
| Nuclear interaction length | 111.4 | g cm-2 | 50.62 | cm |
| Pion collision length | 97.5 | g cm-2 | 44.33 | cm |
| Pion interaction length | 140.7 | g cm-2 | 63.97 | cm |
| Radiation length | 21.21 | g cm-2 | 9.639 | cm |
| Critical energy | 37.92 | MeV (for e-) | 36.84 | MeV (for e+) |
| Molière radius | 11.86 | g cm-2 | 5.391 | cm |
| Plasma energy ℏωp | 29.74 | eV | ||
| Muon critical energy | 552. | GeV |