Selenium Krypton

Bromine (Br)

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.

Bromine in the periodic table

Symbol

Atomic number

Group

Period

Block

Element category

Nonmetal

Physical properties

Phase at STP

Liquid

Density

3.1028 g/cm³

Atomic weight

79.904 u

Melting point

265.8 K
-7.35 °C
18.77 °F

Boiling point

332 K
58.85 °C
137.93 °F

Atomic properties

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

1	1139.9 kJ/mol
2	2103 kJ/mol
3	3470 kJ/mol
4	4560 kJ/mol
5	5760 kJ/mol
6	8550 kJ/mol
7	9940 kJ/mol
8	18600 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)

[Ar] 3d¹⁰ 4s² 4p⁵

Electron configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵

Electrons per shell

2, 8, 18, 7

History

Discovered

1825

Discovered by

Antoine Jérôme Balard
Carl Jacob Löwig