Bromine (Br)

Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas.

Atomic Number

35

Atomic Mass

79.904 u

Category

halogen

Phase

liquid

Density

3.1028 g/cm³

Electron Shells

2, 8, 18, 7

Atomic Structure

Protons: 35 • Electrons: 35 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵

Discovery

1825 • Antoine Jérôme Balard, Carl Jacob Löwig