| Quantity | Value | Units |
Value | Units |
| Atomic number |
9 |
|
| |
| Atomic mass |
18.998403163(6) |
g mole-1 |
| |
| Specific gravity
(20° C, 1 atm) |
1.580E-03 |
g cm-3 |
| |
| Mean excitation energy |
115.0 |
eV |
| |
| Minimum ionization |
1.676 |
MeV g-1cm2 |
2.649E-03 |
MeV cm-1 |
| Nuclear collision length |
65.0 |
g cm-2 |
4.110E+04
| cm |
| Nuclear interaction length |
97.4 |
g cm-2 |
6.164E+04
| cm |
| Pion collision length |
91.0 |
g cm-2 |
5.760E+04
| cm |
| Pion interaction length |
127.2 |
g cm-2 |
8.052E+04
| cm |
| Radiation length |
32.93
| g cm-2 |
2.084E+04
| cm |
| Critical energy |
73.15 |
MeV (for e-) |
71.48
| MeV (for e+) |
| Molière radius |
9.55 |
g cm-2 |
6040.
| cm |
| Plasma energy ℏωp |
0.79 |
eV |
| |
| Muon critical energy |
960. |
GeV |
| |
| Melting point |
53.53 |
K |
-219.6
| C |
| Boiling point @ 1 atm |
85.03
| K |
-188.1
| C |
| Index of refraction
(0° C, 1 atm, Na D) |
195.
| (n-1)x106 |
|
| |
For muons,