Oxygen
Nonmetal| Atomic number | 8 |
|---|---|
| Category | Nonmetal |
| Atomic mass | 15.999 |
| Electron configuration | [He]2s² 2p⁴ |
| Oxidation states | −2 |
| Electronegativity | 3.44 |
| Melting point | -219 °C |
| Boiling point | -183 °C |
| Density | 0.001 g/cm³ |
| Crystal structure | Cubic (solid) |
| Group | 16 |
| Period | 2 |
| Block | p |
| Discovered | 1,774 |
| Crustal abundance | 461,000 ppm |
