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Bromine (Br)
Atomic number 35 · Halogen
| Atomic number | 35 |
|---|---|
| Atomic mass | 79.904 u |
| Molar mass | 79.904 g/mol |
| Category | Halogen |
| Group / period / block | 17 / 4 / p |
| Electron configuration | [Ar] 3d10 4s2 4p5 |
| Electrons per shell | 2, 8, 18, 7 |
| Electronegativity (Pauling) | 2.96 |
| Atomic radius | 115.0 pm |
| Density | 3.1028 g/cm³ |
| First ionisation energy | 11.8138 eV |
| Melting point | 265.95 K (-7.20 °C) |
| Boiling point | 331.95 K (58.80 °C) |
| Common oxidation states | -1, +1, +3, +5 |
| Abundance in Earth's crust | 2.4 ppm |
Uses
Flame retardants, photography
Discovery
1826, Antoine J. Balard