35Br79.904
Bromine
Halogen · element 35 · group 17, period 4
Quick facts
| Symbol | Br |
|---|---|
| Atomic number | 35 |
| Relative atomic mass | 79.904 |
| Category | Halogen |
| Position | group 17, period 4 |
| State at 20 °C | Liquid |
| Melting point | -7.2 °C |
| Boiling point | 58.8 °C |
| Density | 3.103 g/cm³ |
| Electronegativity | 2.96 |
| Electron configuration | [Ar] 3d10 4s2 4p5 |
About Bromine
Bromine has the symbol Br and atomic number 35, which means every bromine atom has 35 protons in its nucleus and, in a neutral atom, 35 electrons. At room temperature it is a liquid.
Halogens are in group 7. They have 7 outer electrons, exist as diatomic molecules (like Cl₂), and get less reactive going down the group.
It melts at -7.2 °C and boils at 58.8 °C.
Explore it
See where bromine sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.