Symbol	Br
Atomic number	35
Group	17 (Fluorine group)
Period	4
Block	p
Classification	Nonmetal

Appearance	-
Color	Red

Number of protons	35 p+
Number of neutrons	45 n0
Number of electrons	35 e-

From Wikipedia, the free encyclopediaBromine (from Ancient Greek:βρῶμος, brómos, meaning "stench") is a chemical element with symbol Br, and atomic number 35. It is a halogen. The element was isolated independently by two chemists, Carl Jacob Löwig and Antoine Jerome Balard, in 1825–1826.

Phase at STP	Liquid
Density	3.1028 g/cm3
Atomic weight	79.901 u

Melting point	265.8 K -7.35 °C 18.77 °F
Boiling point	332 K 58.85 °C 137.93 °F
Heat of vaporization	14.725 kJ/mol

Electronegativity (Pauling Scale)	2.96
Electron affinity	324.537 kJ/mol
Oxidation states	−1, +1, +3, +4, +5, +7 (a strongly acidic oxide)
Ionization energies	1139.9 kJ/mol 2103 kJ/mol 3470 kJ/mol 4560 kJ/mol 5760 kJ/mol 8550 kJ/mol 9940 kJ/mol 18600 kJ/mol

Electron configuration Shorthand configuration	[Ar] 3d10 4s2 4p5
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
Electrons per shell	2, 8, 18, 7
Valence electrons	7
Valency electrons	1,3,5
Bohr model	Figure: Shell diagram of Bromine (Br) atom.
Orbital Diagram	1s 2s 2p 3s 3p 3d 4s 4p

Discovery and first isolation

Antoine Jérôme Balard, Carl Jacob Löwig (1825)

Discovery of bromine Bromine was discovered independently by two chemists, Carl Jacob Löwig and Antoine Balard, in 1825 and 1826, respectively. Löwig isolated bromine from a mineral water spring from his hometown Bad Kreuznach in 1825. Löwig used a solution of the mineral salt saturated with chlorine and extracted the bromine with diethyl ether. The publication of the results was delayed and Balard published his results first. Balard found bromine chemicals in the ash of seaweed from the salt marshes of Montpellier. The seaweed was used to produce iodine, but also contained bromine. Balard distilled the bromine from a solution of seaweed ash saturated with chlorine. The properties of the resulting substance were intermediate between those of chlorine and iodine; thus he tried to prove that the substance was iodine monochloride (ICl), but after failing to do so he was sure that he had found a new element and named it muride, derived from the Latin word muria ("brine").

CAS Number	7726-95-6
ChemSpider ID	4514586
EC number	231-778-1
PubChem CID Number	24408