Bromine was discovered by two chemists, C. Lowg in Germany and Antoine-Jérôme Balard in France in 1825 and 1826, respectively. The name comes from the Greek 'bromos' meaning stench.
Atomic number: 35
Atomic weight: 79.904
Group, period, block: 17, 4, p
Color: gas/liquid: red-brown, solid: metallic luster
Electron configuration: 4s2 3d10 4p5
Density: 3.1028 g/cm-3
Melting point: 265.8 K,-7.2 °C,19 °F
Boiling point: 332.0 K,58.8 °C,137.8 °F
Oxidation states: 7, 5, 4, 3, 1, -1
Electronegativity: 2.96 (Pauling scale)
Ionization energies: 1st: 1139.9 kJ·mol-1
Covalent radius: 120±3 pm
Van der Waals radius: 185 pm
There are two naturally occurring isotopes of bromine exist, 79Br, and 81Br.