35
Br
bromine
79.904

General properties

Group
group 17 (halogens)
Period
period 4
Category
halogens
Standard atomic weight
79.904
[79.901, 79.907]
Melting point
(Br₂) 265.8 K (-7.3 °C)
Boiling point
(Br₂) 332.0 K (58.9 °C)
Phase at STP
liquid

Additional properties

Block
p-block
Electron configuration
[Ar] 3d¹⁰ 4s² 4p⁵
Electrons per shell
2, 8, 18, 7
Electronegativity
2.96
Density
Br₂, liquid: 3.1028 g/cm³
Oxidation states
−1, +1, +3, +4, +5, +7 (a strongly oxide)
CAS Number
7726-95-6