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.
Compounds you can make with bromine
Bromine appears in 3 compounds in our periodic table sandbox. Each one is a real substance with its true chemical formula — combine the right elements in the right ratio below to discover it.
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HBr
Hydrogen Bromide
A sharp-smelling gas that dissolves in water to make hydrobromic acid.
-
NaBr
Sodium Bromide
A salt once prescribed as a sedative and still used in photography and hot tubs.
-
AgBr
Silver Bromide
The light-sensitive salt that made film photography possible.