| Quantity | Value | Units | Value | Units |
| Atomic number | 44 | |||
| Atomic mass | 101.07(2) | g mole-1 | ||
| Specific gravity | 12.41 | g cm-3 | ||
| Mean excitation energy | 441.0 | eV | ||
| Minimum ionization | 1.307 | MeV g-1cm2 | 16.22 | MeV cm-1 |
| Nuclear collision length | 94.3 | g cm-2 | 7.596 | cm |
| Nuclear interaction length | 158.4 | g cm-2 | 12.76 | cm |
| Pion collision length | 118.8 | g cm-2 | 9.574 | cm |
| Pion interaction length | 186.3 | g cm-2 | 15.01 | cm |
| Radiation length | 9.48 | g cm-2 | 0.7641 | cm |
| Critical energy | 13.12 | MeV (for e-) | 12.68 | MeV (for e+) |
| Molière radius | 15.32 | g cm-2 | 1.235 | cm |
| Plasma energy ℏωp | 66.98 | eV | ||
| Muon critical energy | 225. | GeV |