Oxygen vs Iodine
| Property | O Oxygen | I Iodine |
|---|---|---|
| Atomic number | 8 | 53 |
| Symbol | O | I |
| Name | Oxygen | Iodine |
| Category | nonmetal | halogen |
| Standard Atomic Weight | 15.9994 u | 126.90447 u |
| Period | 2 | 5 |
| Group | 16 | 17 |
| Block | p | p |
| Phase at STP | gas | solid |
| Electron configuration | [He]2s22p4 | [Kr]5s24d105p5 |
| Oxidation states | [-2, -1, 0, 1, 2] | [-1, 1, 2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 3.44 | 2.66 |
| Electron affinity | 1.4611 eV | 3.059 eV |
| Density | 1.429 kg/m³ | 4930 kg/m³ |
| Melting point | -218.79 °C | 113.7 °C |
| Boiling point | -182.95 °C | 184.4 °C |
| Discovery year | 1771 | 1811 |