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Argon (Ar)
Atomic number 18 · noble
| Atomic number | 18 |
|---|---|
| Atomic mass | 39.948 u |
| Molar mass | 39.948 g/mol |
| Category | noble |
| Group / period / block | 18 / 3 / p |
| Electron configuration | [Ne] 3s2 3p6 |
| Electrons per shell | 2, 8, 8 |
| Atomic radius | 71.0 pm |
| Density | 0.00163 g/cm³ |
| First ionisation energy | 15.7596 eV |
| Melting point | 83.81 K (-189.34 °C) |
| Boiling point | 87.3 K (-185.85 °C) |
| Abundance in Earth's crust | 3.5 ppm |
Uses
Light bulbs, welding shield gas
Discovery
1894, Sir William Ramsey, Baron Rayleigh