| Attribute | Argon × | Fluorine × |
|---|---|---|
| Atomic mass (u) | 39.9 | 18.99840316 |
| Standard state | Gas | Gas |
| Oxidation states |
|
|
| Electron configuration | [Ne]3s²3p⁶ | [He]2s²2p⁵ |
| Atomic radius (van der waals) (pm) | 188 | 135 |
| Electronegativity (pauling scale) | - | 3.98 |
| Electron affinity (eV) | - | 3.339 |
| Ionization energy (eV) | 15.76 | 17.423 |
| Boiling point (K) | 87.3 | 85.03 |
| Melting point (K) | 83.8 | 53.53 |
| Density (g/cm³) | 0.0017837 | 0.001696 |
| Atomic number | 18 | 9 |
| Group name | Noble gas | Halogen |
| Symbol | Ar | F |
| Discovered (year) | 1894 | 1670 |