Technical data for Magnesium

Overview Name Magnesium Symbol Mg Atomic Number 12 Atomic Weight 24.305 Density 1.738 g/cm3 Melting Point 650 °C Boiling Point 1090 °C Thermal properties Phase Solid Melting Point 650 °C Boiling Point 1090 °C Absolute Melting Point 923 K Absolute Boiling Point 1363 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 8.7 kJ/mol Heat of Vaporization 128 kJ/mol Specific Heat 1020 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 160 W/(m K) Thermal Expansion 0.0000248 K-1 Bulk physical properties Density 1.738 g/cm3 Density (Liquid) 1.584 g/cm3 Molar Volume 0.000013984 Brinell Hardness 260 MPa Mohs Hardness 2.5 Vickers Hardness N/A Bulk Modulus 45 GPa Shear Modulus 17 GPa Young Modulus 45 GPa Poisson Ratio 0.29 Refractive Index N/A Speed of Sound 4602 m/s Thermal Conductivity 160 W/(m K) Thermal Expansion 0.0000248 K-1 Reactivity Valence 2 Electronegativity 1.31 ElectronAffinity 0 kJ/mol Ionization Energies 737.7, 1450.7, 7732.7, 10542.5, 13630, 18020, 21711, 25661, 31653, 35458 kJ/mol Health and Safety DOT Hazard Class 4.1 DOT Numbers 2950 RTECS Number N/A NFPA Label

Classifications Alternate Names None Names of Allotropes None Block s Group 2 Period 3 Series Alkaline Earth Metal Electron Configuration [Ne]3s2 Color Silver Discovery 1755 in The United Kingdom Gas phase N/A CAS Number CAS7439-95-4 CID Number CID5462224 RTECS Number N/A Electrical properties Electrical Type Conductor Electrical Conductivity 2.3×107 S/m Resistivity 4.399999999999×10-8 m Ω Superconducting Point N/A Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 6.9×10-9 m3/Kg Molar Magnetic Susceptibility 1.68×10-10 m3/mol Volume Magnetic Susceptibility 0.000012 Abundances % in Universe 0.059% % in Sun 0.07% % in Meteorites 12% % in Earth's Crust 2.9% % in Oceans 0.13% % in Humans 0.027% Atomic dimensions and structure Atomic Radius 145 pm Covalent Radius 141 pm Van der Waals Radius 173 pm Crystal Structure Simple Hexagonal Lattice Angles π/2, π/2, 2 π/3 Lattice Constants 320.94, 320.94, 521.08 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 0.063 Neutron Mass Absorption 0.0001 Known Isotopes 19Mg, 20Mg, 21Mg, 22Mg, 23Mg, 24Mg, 25Mg, 26Mg, 27Mg, 28Mg, 29Mg, 30Mg, 31Mg, 32Mg, 33Mg, 34Mg, 35Mg, 36Mg, 37Mg, 38Mg, 39Mg, 40Mg Stable Isotopes 24Mg, 25Mg, 26Mg Isotopic Abundances 24Mg 78.99% 25Mg 10% 26Mg 11.01%