| Iodine ✕ | |
|---|---|
| Symbol | I |
| Atomic number | 53 |
| Chemical property | Reactive nonmetal |
| Origin o the name | French iode (after the Greek ioeides, 'violet') |
| Group | 17 |
| Period | 5 |
| Atomic weight (u) | 126.90447 |
| Atomic weight uncertainty (u) | 0.00003 |
| Density (g/cm³) | 4.93 |
| Melting point (K) | 386.85 |
| Boiling point (K) | 457.4 |
| Heat capacity (J/(g·K)) | 0.214 |
| Electro-negativity | 2.66 |
| Abundance in earth's crust (mg/kg) | 0.45 |