35BrBromine79.904[Ar] 3d¹⁰ 4s² 4p⁵
diatomic nonmetal
Bromine
Bromine (from Ancient Greek:βρῶμος, brómos, meaning "stench") is a chemical element with symbol Br, and atomic number 35. It is a halogen. The element was isolated independently by two chemists, Carl Jacob Löwig and Antoine Jerome Balard, in 1825–1826.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
Electrons by shell
Electron configuration
3d10
4s2
4p5
18 is the [Ar] core total across three shells.
At a glance
- Atomic number
- 35
- Atomic mass
- 79.904 u
- Phase
- Liquid
- Density
- 3.1028 g/cm³
- Melting point
- 265.8 K
- Boiling point
- 332 K
- First ionization energy
- 1,139.9 kJ/mol
- Electronegativity
- 2.96
- Electron affinity
- 324.537 kJ/mol
- Molar heat capacity
- Unavailable
- Period
- 4
- Appearance
- Unavailable
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.