Argon
Noble gas| Atomic number | 18 |
|---|---|
| Category | Noble gas |
| Atomic mass | 39.95 |
| Electron configuration | [Ne]3s² 3p⁶ |
| Oxidation states | 0 |
| Melting point | -189 °C |
| Boiling point | -186 °C |
| Density | 0.002 g/cm³ |
| Crystal structure | Face-centred cubic |
| Group | 18 |
| Period | 3 |
| Block | p |
| Discovered | 1,894 |
| Crustal abundance | 3.5 ppm |
