Bromine (Br) — Element 35: Properties & Data | Aladdin Scientific
Bromine(Br) — Element 35
Bromine (Br) is a halogen with atomic number 35 and atomic mass 79.9. It has melting point 265.95 K (-7 °C), boiling point 331.95 K (59 °C), density 3.11 g/cm³. It sits in group 17 and period 4 of the periodic table and was discovered in 1826.
Key facts
| Atomic mass | 79.9000 u |
|---|---|
| Electron configuration | [Ar]4s2 3d10 4p5 |
| Oxidation states | +5, +1, -1 |
| Electronegativity (Pauling) | 2.96 |
| Atomic radius (van der Waals) | 183 pm |
| Ionization energy | 11.814 eV |
| Electron affinity | 3.365 eV |
| Melting point | 265.95 K |
| Boiling point | 331.95 K |
| Density | 3.11 g/cm³ |
| Standard state | Liquid |
| Year discovered | 1826 |
Frequently asked questions
What is the electron configuration of bromine?
The ground-state electron configuration of bromine is [Ar]4s2 3d10 4p5.
What group and period is bromine in?
Bromine (Br) is in group 17 and period 4 of the periodic table, classified as a halogen.
What is the melting point of bromine?
Bromine melts at 265.95 K (-7 °C).
What is the standard state of bromine?
Bromine is a liquid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .