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Oxygen (O)
Atomic number 8 · Non-metal
| Atomic number | 8 |
|---|---|
| Atomic mass | 15.999 u |
| Molar mass | 15.999 g/mol |
| Category | Non-metal |
| Group / period / block | 16 / 2 / p |
| Electron configuration | [He] 2s2 2p4 |
| Electrons per shell | 2, 6 |
| Electronegativity (Pauling) | 3.44 |
| Atomic radius | 60.0 pm |
| Density | 0.00131 g/cm³ |
| First ionisation energy | 13.6181 eV |
| Melting point | 54.36 K (-218.79 °C) |
| Boiling point | 90.19 K (-182.96 °C) |
| Common oxidation states | -2 |
| Abundance in Earth's crust | 461000 ppm |
Uses
Breathing, hospitals, steel making, welding
Discovery
1774, Joseph Priestly, Carl Wilhelm Scheele