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Iodine (I)
Atomic number 53 · Halogen
| Atomic number | 53 |
|---|---|
| Atomic mass | 126.90447 u |
| Molar mass | 126.90447 g/mol |
| Category | Halogen |
| Group / period / block | 17 / 5 / p |
| Electron configuration | [Kr] 4d10 5s2 5p5 |
| Electrons per shell | 2, 8, 18, 18, 7 |
| Electronegativity (Pauling) | 2.66 |
| Atomic radius | 140.0 pm |
| Density | 4.933 g/cm³ |
| First ionisation energy | 10.4512 eV |
| Melting point | 386.85 K (113.70 °C) |
| Boiling point | 457.55 K (184.40 °C) |
| Common oxidation states | -1, +1, +3, +5, +7 |
| Abundance in Earth's crust | 0.45 ppm |
Uses
Iodised salt, antiseptic, thyroid health
Discovery
1811, Bernard Courtois