Electronic data		Thermal data		Steric data
Shells: 2,8,18,7 Orbitals: [Ar] 3d10 4s2 4p5 Electronegativity: 2.7, 2.8 1. Ionization potential: 11.8138 eV 2. Ionization potential: 21.8 eV 3. Ionization potential: 36.0 eV Oxidation states: 7,5,3,1,-1 Electrical conductivity: --		Melting point: -7.2 °C Boiling point: 58.78 °C Specific heat: 0.473 J/gK Heat of fusion: 5.286 kJ/mol Heat of vaporization: 15.438 kJ/mol Thermal conductivity: 0.00122 W/cmK		Atomic radius: 1.12 Å Ionic radius: 1.96 Å () Covalent radius: 1.14 Å Atomic volume: 25.6 cm³/mol Density (293 K): 3.119 g/cm³ Crystal structure: Orthorhombic

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
76Br	0	76	1	16.0h	+,EC	View
77Br	0	76.921	3/2	2.376d	EC,+	View
79Br	50.54	78.9183	3/2	--	stable	--
80Br	0	80	1	17.66m	-,EC,+	View
80Brm	0	80	9/2	4.42h	IT	View
81Br	49.46	80.9163	3/2	--	stable	--
82Br0	81.917	5	1.471d	b-	br82d.png	View
83Br	0	83	3/2	2.40h	-,b-	View
84Br	0	84	2	31.8m	-	View
85Br	0	85	3/2	2.87m	-,b-	View

Legend

Name origin:	Greek: brômos (stench)
Description:	Redish-brown liquid.
Discovered by:	Antoine J. Balard
Year:	1826
Place:	France
Sources:	Occurs in compounds in sea water.
Use(s):	It was once used in large quantities to make a compound that removed lead compound build up in engines burning leaded gasoline. Now it is primarily used in dyes, disinfectants, and photographic chemicals.