Br

Bromine

Identification

CAS Number: 7726-95-6

Discovery Year: 1826

Discoverer: Antoine J. Balard

Discovery Location: France

Properties

Atomic Mass: 79.904 →Density: 3.1028 g/cm³ →

Crust Abundance: 2.4 mg/kg

Crystal Structure: ORC

Atomic Dimensions

Atomic Radius: 115 pm →

Atomic Radius (Rahm): 219 pm

Covalent Radius: 120 pm →

Van der Waals Radius: 185 pm

Atomic Volume: 23.5 cm³/mol

Lattice Constant: 6.67 Å

Thermodynamics

Melting Point: 265.9 K →Boiling Point: 331.9 K →Thermal Conductivity: 0.005 W/(m·K) →Heat of Fusion: 10.57 kJ/mol →Heat of Vaporization: 29.56 kJ/mol →

Heat of Formation: 111.85 kJ/mol

Electronic Structure

Electron Config: [Ar] 3d10 4s2 4p5

Block: p

Period: 4 →Group: 17 →Electronegativity: 2.96 →Electron Affinity: 3.3635882000000006 eV →

Oxidation States: -1, +1, +3, +5, +7

Abundance & Geochemistry

Crust Abundance: 2.4 mg/kg

Sea Abundance: 67.3 mg/L

Geochemical Class: semi-volatile

Goldschmidt Class: litophile

About

Halogen element. Red volatile liquid at room temperature. Its reactivity is somewhere between chlorine and iodine. Harmful to human tissue in a liquid state, the vapour irritates eyes and throat. Discovered in 1826 by Antoine Balard.

Isotopes

Br-79 79 50.50%

Br-81 81 49.20%