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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

SymbolBr
Atomic number35
Group17
Period4
Blockp
Element categoryNonmetal

Physical properties

Phase at STPLiquid
Density3.1028 g/cm3
Atomic weight79.904 u
Melting point265.8 K
-7.35 °C
18.77 °F
Boiling point332 K
58.85 °C
137.93 °F

Atomic properties

Electronegativity (Pauling Scale)2.96
Electron affinity324.537 kJ/mol
Oxidation states−1, +1, +3, +4, +5, +7
(a strongly acidic oxide)
Ionization energies
11139.9 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 configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
Electrons per shell2, 8, 18, 7

History

Discovered1825
Discovered byAntoine Jérôme Balard
Carl Jacob Löwig
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