Iodine is a non-metallic element from the periodic table. It is a dark-purple solid at room temperature, and it has a sharp, pungent odor. Iodine is used in the production of medical tablets and in photography. It is also used to test for the presence of starch.
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| Atomic number | 53 |
| Group | VIIA |
| Period | 5 |
| Mass | 126.90447 |
| Latin name | Iodum |
| Electron configuration | [Cd]5p5 |
| Oxidation state | -1, 0, 1, 3, 4, 5, 6, 7 |