Bromine
Atomic Number: 35
Symbol: Br
Atomic Weight: 79.904
Electron Configuration: [Ar]4s23d104p5
Word Origin: Greek bromos: stench
Element Classification: Halogen
Discovery: Antoine J. Balard (1826, France)
Density (g/cc): 3.12
Melting Point (°K): 265.9
Boiling Point (°K): 331.9
Appearance: reddish-brown liquid, metallic luster in solid form
Atomic Volume (cc/mol): 23.5
Covalent Radius (pm): 114
Ionic Radius: 47 (+5e) 196 (-1e)
Specific Heat (@20°C J/g mol): 0.473 (Br-Br)
Fusion Heat (kJ/mol): 10.57 (Br-Br)
Evaporation Heat (kJ/mol): 29.56 (Br-Br)
Pauling Negativity Number: 2.96
First Ionizing Energy (kJ/mol): 1142.0
Oxidation States: 7, 5, 3, 1, -1
Lattice Structure: Orthorhombic
Lattice Constant (Å): 6.670
Magnetic Ordering: nonmagnetic
Electrical Resistivity (20 °C): 7.8×1010 Ω·m
Thermal Conductivity (300 K): 0.122 W·m−1·K−1
CAS Registry Number: 7726-95-6
Sources: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952)
Return to the Periodic Table
