Quantity | Value | Units | Value | Units |
Atomic number | 2 | |||
Atomic mass | 4.002602(2) | g mole-1 | ||
Specific gravity | 0.1249 | g cm-3 | ||
Mean excitation energy | 41.8 | eV | ||
Minimum ionization | 1.936 | MeV g-1cm2 | 0.2418 | MeV cm-1 |
Nuclear collision length | 51.8 | g cm-2 | 415.1 | cm |
Nuclear interaction length | 71.0 | g cm-2 | 568.4 | cm |
Pion collision length | 79.5 | g cm-2 | 636.2 | cm |
Pion interaction length | 103.6 | g cm-2 | 829.5 | cm |
Radiation length | 94.32 | g cm-2 | 755.2 | cm |
Critical energy | 208.25 | MeV (for e-) | 203.34 | MeV (for e+) |
Molière radius | 9.60 | g cm-2 | 76.90 | cm |
Plasma energy ℏωp | 7.20 | eV | ||
Muon critical energy | 2020. | GeV | ||
Boiling point @ 1 atm | 4.220 | K | -268.9 | C |
Index of refraction (Na D) | 1.024 |