Oxygen vs Chlorine
| Property | O Oxygen | Cl Chlorine |
|---|---|---|
| Atomic number | 8 | 17 |
| Symbol | O | Cl |
| Name | Oxygen | Chlorine |
| Category | nonmetal | halogen |
| Standard Atomic Weight | 15.9994 u | 35.4515 u |
| Period | 2 | 3 |
| Group | 16 | 17 |
| Block | p | p |
| Phase at STP | gas | gas |
| Electron configuration | [He]2s22p4 | [Ne]3s23p5 |
| Oxidation states | [-2, -1, 0, 1, 2] | [-1, 1, 2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 3.44 | 3.16 |
| Electron affinity | 1.4611 eV | 3.6127 eV |
| Density | 1.429 kg/m³ | 3.214 kg/m³ |
| Melting point | -218.79 °C | -101.5 °C |
| Boiling point | -182.95 °C | -34.04 °C |
| Discovery year | 1771 | 1774 |