Iodine
chemical element
iodine (I), chemical element, a member of the halogen elements, or Group 17 (Group VIIa) of the periodic table.
| atomic number | 53 |
|---|---|
| atomic weight | 126.9044 |
| melting point | 113.5 °C (236 °F) |
| boiling point | 184 °C (363 °F) |
| specific gravity | 4.93 at 20 °C (68 °F) |
| oxidation states | −1, +1, +3, +5, +7 |
| electron configuration | 2-8-18-18-7 or (Kr)5s24d105p5 |
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