Bromine (Br)
Bromine (Br) is element 35 of the periodic table, a halogen in period 4 and group 17. Its standard atomic weight is 79.904, so one mole of bromine atoms has a mass of 79.904 g. At room temperature it is a liquid; it melts at -7.2 °C and boils at 58.8 °C.
| Atomic number | 35 |
|---|---|
| Symbol | Br |
| Standard atomic weight | 79.904 |
| Molar mass | 79.904 g/mol |
| Category | Halogen |
| Group | 17 |
| Period | 4 |
| Block | p-block |
| Electron configuration | [Ar] 4s2 3d10 4p5 |
| Oxidation states | +5, +1, −1 |
| Electronegativity (Pauling) | 2.96 |
| Atomic radius (van der Waals) | 183 pm |
| First ionisation energy | 11.814 eV (1139.9 kJ/mol) |
| Electron affinity | 3.365 eV |
| State at room temperature | Liquid |
| Melting point | 265.95 K (-7.2 °C) |
| Boiling point | 331.95 K (58.8 °C) |
| Density | 3.11 g/cm³ |
| Discovered | 1826 |
Group 17
Calculate with Bromine
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.