Technical data for Platinum

Overview Name Platinum Symbol Pt Atomic Number 78 Atomic Weight 195.084 Density 21.45 g/cm3 Melting Point 1768.3 °C Boiling Point 3825 °C Thermal properties Phase Solid Melting Point 1768.3 °C Boiling Point 3825 °C Absolute Melting Point 2041.4 K Absolute Boiling Point 4098 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 20 kJ/mol Heat of Vaporization 490 kJ/mol Specific Heat 133 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 71 W/(m K) Thermal Expansion 8.9×10-6 K-1 Bulk physical properties Density 21.45 g/cm3 Density (Liquid) 19.77 g/cm3 Molar Volume 9.0948×10-6 Brinell Hardness 392 MPa Mohs Hardness 3.5 Vickers Hardness 549 MPa Bulk Modulus 230 GPa Shear Modulus 61 GPa Young Modulus 168 GPa Poisson Ratio 0.38 Refractive Index N/A Speed of Sound 2680 m/s Thermal Conductivity 71 W/(m K) Thermal Expansion 8.9×10-6 K-1 Reactivity Valence 6 Electronegativity 2.28 ElectronAffinity 205.3 kJ/mol Ionization Energies 870, 1791 kJ/mol Health and Safety DOT Hazard Class 4.1 DOT Numbers 3089 RTECS Number RTECSTP2160000 NFPA Label

Classifications Alternate Names None Names of Allotropes None Block d Group 10 Period 6 Series Transition Metal Electron Configuration [Xe]6s14f145d9 Color Gray Discovery 1735 in Peru Gas phase N/A CAS Number CAS7440-06-4 CID Number CID23939 RTECS Number RTECSTP2160000 Electrical properties Electrical Type Conductor Electrical Conductivity 9.4×106 S/m Resistivity 1.1×10-7 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 1.22×10-8 m3/Kg Molar Magnetic Susceptibility 2.38×10-9 m3/mol Volume Magnetic Susceptibility 0.0002573 Abundances % in Universe 5×10-7% % in Sun 9×10-7% % in Meteorites 0.000098% % in Earth's Crust 3.7×10-6% % in Oceans N/A % in Humans N/A Atomic dimensions and structure Atomic Radius 177 pm Covalent Radius 136 pm Van der Waals Radius 175 pm Crystal Structure Face-centered Cubic Lattice Angles π/2, π/2, π/2 Lattice Constants 392.42, 392.42, 392.42 pm Space Group Name Fm_ 3m Space Group Number 225 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 3D3 Neutron Cross Section 10 Neutron Mass Absorption 0.002 Known Isotopes 166Pt, 167Pt, 168Pt, 169Pt, 170Pt, 171Pt, 172Pt, 173Pt, 174Pt, 175Pt, 176Pt, 177Pt, 178Pt, 179Pt, 180Pt, 181Pt, 182Pt, 183Pt, 184Pt, 185Pt, 186Pt, 187Pt, 188Pt, 189Pt, 190Pt, 191Pt, 192Pt, 193Pt, 194Pt, 195Pt, 196Pt, 197Pt, 198Pt, 199Pt, 200Pt, 201Pt, 202Pt Stable Isotopes 192Pt, 194Pt, 195Pt, 196Pt, 198Pt Isotopic Abundances 190Pt 0.014% 192Pt 0.782% 194Pt 32.967% 195Pt 33.832% 196Pt 25.242% 198Pt 7.163%