The third most common gas in the air, and completely uninterested in reacting with any of it.
- Atomic number
- 18
- Atomic mass
- 39.948 u
- Phase
- Gas
- Electron configuration
- [Ne] 3s² 3p⁶
- Melting point
- 83.8 K · -189.3 °C
- Boiling point
- 87.3 K · -185.8 °C
- Density
- 0.002 g/cm³
- Electronegativity
- —
- Period / Group
- 3 / 18
- Discovery year
- 1894