Technical data for Bromine

Overview Name Bromine Symbol Br Atomic Number 35 Atomic Weight 79.904 Density 3.12 g/cm3 Melting Point -7.3 °C Boiling Point 59 °C Thermal properties Phase Liquid Melting Point -7.3 °C Boiling Point 59 °C Absolute Melting Point 265.8 K Absolute Boiling Point 332 K Critical Pressure 10.34 MPa (102 Atm) Critical Temperature 588 K Heat of Fusion 5.8 kJ/mol Heat of Vaporization 14.8 kJ/mol Specific Heat 947.3 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 0.12 W/(m K) Thermal Expansion N/A Bulk physical properties Density 3.12 g/cm3 Density (Liquid) 3.12 g/cm3[note] Molar Volume 0.00002561 Brinell Hardness N/A Mohs Hardness N/A Vickers Hardness N/A Bulk Modulus 1.9 GPa Shear Modulus N/A Young Modulus N/A Poisson Ratio N/A Refractive Index 1.001132 Speed of Sound N/A Thermal Conductivity 0.12 W/(m K) Thermal Expansion N/A Reactivity Valence 5 Electronegativity 2.96 ElectronAffinity 324.6 kJ/mol Ionization Energies 1139.9, 2103, 3470, 4560, 5760, 8550, 9940, 18600 kJ/mol Health and Safety DOT Hazard Class 8 DOT Numbers 1744 RTECS Number RTECSEF9100000 NFPA Label

Classifications Alternate Names None Names of Allotropes Dibromine Block p Group 17 Period 4 Series Halogen Electron Configuration [Ar]4s23d104p5 Color Red Discovery 1826 in France Gas phase N/A CAS Number CAS7726-95-6 CID Number CID24408 RTECS Number RTECSEF9100000 Electrical properties Electrical Type Insulator Electrical Conductivity 1×10-10 S/m Resistivity 1×1010 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Diamagnetic Curie Point N/A Mass Magnetic Susceptibility -4.9×10-9 m3/Kg Molar Magnetic Susceptibility -7.83×10-10 m3/mol Volume Magnetic Susceptibility -0.0000153 Abundances % in Universe 7×10-7% % in Sun N/A % in Meteorites 0.00012% % in Earth's Crust 0.0003% % in Oceans 0.0066% % in Humans 0.00029% Atomic dimensions and structure Atomic Radius 94 pm Covalent Radius 120 pm Van der Waals Radius 185 pm Crystal Structure Base Orthorhombic Lattice Angles π/2, π/2, π/2 Lattice Constants 672.65, 464.51, 870.23 pm Space Group Name Cmca Space Group Number 64 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 2P3/2 Neutron Cross Section 6.8 Neutron Mass Absorption 0.002 Known Isotopes 67Br, 68Br, 69Br, 70Br, 71Br, 72Br, 73Br, 74Br, 75Br, 76Br, 77Br, 78Br, 79Br, 80Br, 81Br, 82Br, 83Br, 84Br, 85Br, 86Br, 87Br, 88Br, 89Br, 90Br, 91Br, 92Br, 93Br, 94Br, 95Br, 96Br, 97Br Stable Isotopes 79Br, 81Br Isotopic Abundances 79Br 50.69% 81Br 49.31%