| Oxygen ✕ | |
|---|---|
| Symbol | O |
| Atomic number | 8 |
| Chemical property | Reactive nonmetal |
| Origin o the name | from the Greek oxy-, both 'sharp' and 'acid', and -gen, meaning 'acid-forming' |
| Group | 16 |
| Period | 2 |
| Atomic weight (u) | 15.999 |
| Atomic weight uncertainty (u) | 0 |
| Density (g/cm³) | 0.001429 |
| Melting point (K) | 54.36 |
| Boiling point (K) | 90.2 |
| Heat capacity (J/(g·K)) | 0.918 |
| Electro-negativity | 3.44 |
| Abundance in earth's crust (mg/kg) | 461000 |