Element 35
Bromine (Br)
Bromine (Br) is element 35 of the periodic table, a halogen in period 4, group 17 (p-block) with an atomic mass of 79.904 and is a liquid at standard conditions.
At a glance
- Atomic number
- 35
- Symbol
- Br
- Atomic mass
- 79.904 u
- Category
- Halogens
- Period
- 4
- Group
- 17
- Block
- p-block
- Phase at STP
- liquid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
- Shorthand configuration
- [Ar] 3d10 4s2 4p5
- Electrons per shell
- 2, 8, 18, 7
- Oxidation states
- -1, +1, +3, +4, +5, +7
Physical properties
- Melting point
- 265.8 K
- Boiling point
- 332 K
- Density
- 3.122 g/cm3
- Phase
- liquid
Atomic properties
- Electronegativity (Pauling)
- 2.96
- Atomic radius
- 94 pm
- Covalent radius
- 120 pm
- Van der Waals radius
- 185 pm
- First ionization energy
- 1140 kJ/mol
- Electron affinity
- 325 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Br-79 | 78.91834 | 50.69% | Stable |
Common uses
- Flame retardants
- Pesticides
- Water purification
- Photography
Discovery
- Year
- 1826
- Discovered by
- Antoine Jérôme Balard
- Country
- France