Br
Bromine
Atomic number: 35Mass: 79.904 uCategory: Halogen
About Bromine
Bromine is the only nonmetal that is a liquid at room temperature (besides mercury, a metal). It is a dark reddish-brown liquid with suffocating fumes. Bromine is quite reactive and has many important industrial applications.
Properties
Period
4
Group
17
Block
P
Category
Halogen
Electronegativity
2.96 (Pauling)
Ionization Energy
1139.9 kJ/mol
Melting Point
266 K (-7°C)
Boiling Point
332 K (59°C)
Density
3.1028 g/cm³
Oxidation States
-1, +1, +3, +5
Electron Configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
[Ar] 3d¹⁰ 4s² 4p⁵
Shell 1:2e⁻
Shell 2:8e⁻
Shell 3:18e⁻
Shell 4:7e⁻
Real-World Uses
Flame retardants
Swimming pool disinfectant
Photography
Pharmaceuticals
Fumigants
Fun Fact
Bromine is one of only two elements that are liquid at room temperature — the other is mercury!