Bromine
Reactive Nonmetal
Bromine (Br) is a chemical element with atomic number 35, classified as a reactive nonmetal. At room temperature it is a liquid. It was discovered in 1826 by Antoine Jérôme Balard.
Properties
- Atomic number
- 35
- Atomic mass
- 79.904 u
- Category
- Reactive Nonmetal
- Group
- 17
- Period
- 4
- Block
- p-block
- Electron configuration
- [Ar] 3d¹⁰ 4s² 4p⁵
- Phase at STP
- Liquid
- Density
- 3.122 g/cm³
- Melting point
- 265.8 K (-7.3 °C)
- Boiling point
- 332 K (58.9 °C)
- Electronegativity
- 2.96
- Atomic radius
- 94 pm
- Ionization energy
- 11.814 eV
- Discovery
- 1826 · Antoine Jérôme Balard
Common uses
Flame retardants, water purification, photography, medicines
Did you know?
Only element that's liquid at room temperature besides mercury.