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.
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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

Atomära egenskaper

Electronegativity (Pauling Scale)2.96
Electron affinity324.537 kJ/mol
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

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
Electrons per shell2, 8, 18, 7

History

Discovered1825
Discovered byAntoine Jérôme Balard
Carl Jacob Löwig