| Quantity | Value | Units | Value | Units |
| Atomic number | 21 | |||
| Atomic mass | 44.955912(6) | g mole-1 | ||
| Density | 2.99 | g cm-3 | ||
| Mean excitation energy | 216.0 | eV | ||
| Minimum ionization | 1.522 | MeV g-1cm2 | 4.550 | MeV cm-1 |
| Nuclear collision length | 77.7 | g cm-2 | 26.01 | cm |
| Nuclear interaction length | 123.9 | g cm-2 | 41.45 | cm |
| Pion collision length | 103.3 | g cm-2 | 34.55 | cm |
| Pion interaction length | 152.9 | g cm-2 | 51.16 | cm |
| Radiation length | 16.55 | g cm-2 | 5.535 | cm |
| Critical energy | 27.61 | MeV (for e-) | 26.79 | MeV (for e+) |
| Molière radius | 12.71 | g cm-2 | 4.252 | cm |
| Plasma energy |
34.05 | eV | ||
| Muon critical energy | 422. | GeV |