Bromine

Halogens · Group 17 · Period 4

Atomic properties

Atomic number	35
Symbol	Br
Standard atomic weight	79.904
Classification	Halogens
Group	17
Period	4
Block	p-block
Electron configuration	[Ar] 3d10 4s2 4p5
Electronegativity (Pauling)	2.96
Common oxidation states	+5, +1, -1

Physical properties

Phase at 20 °C	Liquid
Density	3.12 g/cm³
Melting point	-7.2 °C
Boiling point	58.8 °C
Discovered	1826
CAS number	—

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