Oxygen |
| Symbol | O |
|---|---|
| Latin name | Oxygenium |
| Atomic number | 8 |
| Period | 2 |
| Element category | Nonmetals |
| Relative atomic mass | 15.9994 |
| Group | VI.A |
| Electronegativity | 3.5 |
| Oxidation numbers | -2, -1, 2 |
| Electron configuration | 1s2 2s2 2p4 |
| Density [g/cm3] | 0.001429 |
| State | Gas |
| Melting point [°C] | -218.79 |
| Boiling point [°C] | -182.962 |
| Critical point [°C] | -118.56 |
| Critical pressure [MPa] | 5.043 |
| Atomic radius [pm] | 48 |
| Covalent radius [pm] | 73 |
| Thermal conductivity [W m-1K-1] | 0.2674 |
| Heat capacity [J K-1g-1] | 0.92 |
| Discovery | 1774 |
| 1.st ionization energy [eV] | 13.6181 |
| 2.nd ionization energy [eV] | 35.117 |
| 3.rd ionization energy [eV] | 54.934 |
| Stable isotopes | 3 |
| Unstable isotopes | 5 |