| Attribute | Value |
|---|---|
| Symbol | Ar |
| Standard state | Gas |
| Atomic mass | 39.9 u |
| Electron configuration | [Ne]3s²3p⁶ |
| Oxidation states |
|
| Atomic radius (van der waals) | 188 pm |
| Ionization energy | 15.76 eV |
| Melting point | 83.8 K |
| Boiling point | 87.3 K |
| Density | 0.0017837 g/cm³ |
| Atomic number | 18 |
| Group name | Noble gas |
| Discovered | 1894 year |
| Electronegativity (pauling scale) | Add |
| Electron affinity | Add |