Technical data for Gold

Overview Name Gold Symbol Au Atomic Number 79 Atomic Weight 196.966569 Density 19.3 g/cm3 Melting Point 1064.18 °C Boiling Point 2856 °C Thermal properties Phase Solid Melting Point 1064.18 °C Boiling Point 2856 °C Absolute Melting Point 1337.33 K Absolute Boiling Point 3129 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 12.5 kJ/mol Heat of Vaporization 330 kJ/mol Specific Heat 129.1 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 320 W/(m K) Thermal Expansion 0.0000142 K-1 Bulk physical properties Density 19.3 g/cm3 Density (Liquid) 17.31 g/cm3 Molar Volume 0.00001021 Brinell Hardness 2450 MPa Mohs Hardness 2.5 Vickers Hardness 216 MPa Bulk Modulus 220 GPa Shear Modulus 27 GPa Young Modulus 78 GPa Poisson Ratio 0.44 Refractive Index N/A Speed of Sound 1740 m/s Thermal Conductivity 320 W/(m K) Thermal Expansion 0.0000142 K-1 Reactivity Valence 5 Electronegativity 2.54 ElectronAffinity 222.8 kJ/mol Ionization Energies 890.1, 1980 kJ/mol Health and Safety DOT Hazard Class N/A DOT Numbers N/A RTECS Number RTECSMD5070000 NFPA Label

Classifications Alternate Names Aurum Names of Allotropes None Block d Group 11 Period 6 Series Transition Metal Electron Configuration [Xe]6s14f145d10 Color Gold Discovery 2500 BC Gas phase N/A CAS Number CAS7440-57-5 CID Number CID23985 RTECS Number RTECSMD5070000 Electrical properties Electrical Type Conductor Electrical Conductivity 4.5×107 S/m Resistivity 2.2×10-8 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Diamagnetic Curie Point N/A Mass Magnetic Susceptibility -1.78×10-9 m3/Kg Molar Magnetic Susceptibility -3.51×10-10 m3/mol Volume Magnetic Susceptibility -0.0000344 Abundances % in Universe 6×10-8% % in Sun 1×10-7% % in Meteorites 0.000017% % in Earth's Crust 3.1×10-7% % in Oceans 5×10-9% % in Humans 0.00001% Atomic dimensions and structure Atomic Radius 174 pm Covalent Radius 136 pm Van der Waals Radius 166 pm Crystal Structure Face-centered Cubic Lattice Angles π/2, π/2, π/2 Lattice Constants 407.82, 407.82, 407.82 pm Space Group Name Fm_ 3m Space Group Number 225 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 2S1/2 Neutron Cross Section 98.7 Neutron Mass Absorption 0.017 Known Isotopes 169Au, 170Au, 171Au, 172Au, 173Au, 174Au, 175Au, 176Au, 177Au, 178Au, 179Au, 180Au, 181Au, 182Au, 183Au, 184Au, 185Au, 186Au, 187Au, 188Au, 189Au, 190Au, 191Au, 192Au, 193Au, 194Au, 195Au, 196Au, 197Au, 198Au, 199Au, 200Au, 201Au, 202Au, 203Au, 204Au, 205Au Stable Isotopes 197Au Isotopic Abundances 197Au 100%