Technical data for Zinc

Overview Name Zinc Symbol Zn Atomic Number 30 Atomic Weight 65.38 Density 7.14 g/cm3 Melting Point 419.53 °C Boiling Point 907 °C Thermal properties Phase Solid Melting Point 419.53 °C Boiling Point 907 °C Absolute Melting Point 692.68 K Absolute Boiling Point 1180 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 7.35 kJ/mol Heat of Vaporization 119 kJ/mol Specific Heat 388 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 120 W/(m K) Thermal Expansion 0.0000302 K-1 Bulk physical properties Density 7.14 g/cm3 Density (Liquid) 6.57 g/cm3 Molar Volume 9.157×10-6 Brinell Hardness 412 MPa Mohs Hardness 2.5 Vickers Hardness N/A Bulk Modulus 70 GPa Shear Modulus 43 GPa Young Modulus 108 GPa Poisson Ratio 0.25 Refractive Index 1.00205 Speed of Sound 3700 m/s Thermal Conductivity 120 W/(m K) Thermal Expansion 0.0000302 K-1 Reactivity Valence 2 Electronegativity 1.65 ElectronAffinity 0 kJ/mol Ionization Energies 906.4, 1733.3, 3833, 5731, 7970, 10400, 12900, 16800, 19600, 23000, 26400, 29990, 40490, 43800, 47300, 52300, 55900, 59700, 67300, 71200, 179100 kJ/mol Health and Safety DOT Hazard Class 4.3 DOT Numbers 1436 RTECS Number RTECSZG8600000 NFPA Label

Classifications Alternate Names None Names of Allotropes None Block d Group 12 Period 4 Series Transition Metal Electron Configuration [Ar]4s23d10 Color SlateGray Discovery 1500 in Germany Gas phase N/A CAS Number CAS7440-66-6 CID Number CID23994 RTECS Number RTECSZG8600000 Electrical properties Electrical Type Conductor Electrical Conductivity 1.7×107 S/m Resistivity 5.900000000001×10-8 m Ω Superconducting Point 0.85 Magnetic properties Magnetic Type Diamagnetic Curie Point N/A Mass Magnetic Susceptibility -2.21×10-9 m3/Kg Molar Magnetic Susceptibility -1.45×10-10 m3/mol Volume Magnetic Susceptibility -0.0000158 Abundances % in Universe 0.00003% % in Sun 0.0002% % in Meteorites 0.018% % in Earth's Crust 0.0078% % in Oceans 5×10-7% % in Humans 0.0033% Atomic dimensions and structure Atomic Radius 142 pm Covalent Radius 122 pm Van der Waals Radius 139 pm Crystal Structure Simple Hexagonal Lattice Angles π/2, π/2, 2 π/3 Lattice Constants 266.49, 266.49, 494.68 pm Space Group Name P63/mmc Space Group Number 194 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 1S0 Neutron Cross Section 1.1 Neutron Mass Absorption 0.00055 Known Isotopes 54Zn, 55Zn, 56Zn, 57Zn, 58Zn, 59Zn, 60Zn, 61Zn, 62Zn, 63Zn, 64Zn, 65Zn, 66Zn, 67Zn, 68Zn, 69Zn, 70Zn, 71Zn, 72Zn, 73Zn, 74Zn, 75Zn, 76Zn, 77Zn, 78Zn, 79Zn, 80Zn, 81Zn, 82Zn, 83Zn Stable Isotopes 64Zn, 66Zn, 67Zn, 68Zn, 70Zn Isotopic Abundances 64Zn 48.63% 66Zn 27.9% 67Zn 4.1% 68Zn 18.75% 70Zn 0.62%