Iodine
Reactive Nonmetal
Iodine (I) is a chemical element with atomic number 53, classified as a reactive nonmetal. At room temperature it is a solid. It was discovered in 1811 by Bernard Courtois.
Properties
- Atomic number
- 53
- Atomic mass
- 126.9 u
- Category
- Reactive Nonmetal
- Group
- 17
- Period
- 5
- Block
- p-block
- Electron configuration
- [Kr] 4d¹⁰ 5s² 5p⁵
- Phase at STP
- Solid
- Density
- 4.93 g/cm³
- Melting point
- 386.85 K (113.7 °C)
- Boiling point
- 457.4 K (184.3 °C)
- Electronegativity
- 2.66
- Atomic radius
- 115 pm
- Ionization energy
- 10.451 eV
- Discovery
- 1811 · Bernard Courtois
Common uses
Antiseptics, table salt, medical imaging, photography
Did you know?
Essential for thyroid function and deficiency causes goiter.