| Quantity | Value | Units | Value | Units |
| Atomic number | 57 | |||
| Atomic mass | 138.90547(7) | g mole-1 | ||
| Specific gravity | 6.145 | g cm-3 | ||
| Mean excitation energy | 501.0 | eV | ||
| Minimum ionization | 1.231 | MeV g-1cm2 | 7.563 | MeV cm-1 |
| Nuclear collision length | 102.4 | g cm-2 | 16.66 | cm |
| Nuclear interaction length | 175.3 | g cm-2 | 28.52 | cm |
| Pion collision length | 126.4 | g cm-2 | 20.56 | cm |
| Pion interaction length | 202.6 | g cm-2 | 32.97 | cm |
| Radiation length | 8.14 | g cm-2 | 1.324 | cm |
| Critical energy | 10.63 | MeV (for e-) | 10.27 | MeV (for e+) |
| Molière radius | 16.24 | g cm-2 | 2.643 | cm |
| Plasma energy ℏωp | 45.76 | eV | ||
| Muon critical energy | 188. | GeV |