| Attribute | Value |
|---|---|
| Symbol | I |
| Standard state | Solid |
| Atomic mass | 126.9045 u |
| Electron configuration | [Kr]5s²4d¹⁰5p⁵ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 2.66 |
| Atomic radius (van der waals) | 198 pm |
| Ionization energy | 10.451 eV |
| Electron affinity | 3.059 eV |
| Melting point | 386.85 K |
| Boiling point | 457.55 K |
| Density | 4.93 g/cm³ |
| Atomic number | 53 |
| Group name | Halogen |
| Discovered | 1811 year |