| Quantity | Value | Units | Value | Units | 
| <Z/A> | 0.51529 | |||
| Specific gravity | 1.106 | g cm-3 | ||
| Mean excitation energy | 89.1 | eV | ||
| Minimum ionization | 1.821 | MeV g-1cm2 | 2.014 | MeV cm-1 | 
| Nuclear collision length | 62.0 | g cm-2 | 56.07 | cm | 
| Nuclear interaction length | 90.5 | g cm-2 | 81.88 | cm | 
| Pion collision length | 89.2 | g cm-2 | 80.70 | cm | 
| Pion interaction length | 122.5 | g cm-2 | 110.7 | cm | 
| Radiation length | 31.21 | g cm-2 | 28.22 | cm | 
| Critical energy | 62.47 | MeV (for e-) | 60.79 | MeV (for e+) | 
| Molière radius | 10.59 | g cm-2 | 9.580 | cm | 
| Plasma energy ℏωp | 21.75 | eV | ||
| Muon critical energy | 843. | GeV | 
| Elem | Z | Atomic frac* | Mass frac | 
| 1 | |||
| 6 | |||
| 17 | |||
| * calculated from mass fraction data | |||