Technical data for Molybdenum

Overview Name Molybdenum Symbol Mo Atomic Number 42 Atomic Weight 95.95 Density 10.28 g/cm3 Melting Point 2623 °C Boiling Point 4639 °C Thermal properties Phase Solid Melting Point 2623 °C Boiling Point 4639 °C Absolute Melting Point 2896 K Absolute Boiling Point 4912 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 36 kJ/mol Heat of Vaporization 600 kJ/mol Specific Heat 251 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 139 W/(m K) Thermal Expansion 4.8×10-6 K-1 Bulk physical properties Density 10.28 g/cm3 Density (Liquid) 9.33 g/cm3 Molar Volume 9.334×10-6 Brinell Hardness 1500 MPa Mohs Hardness 5.5 Vickers Hardness 1530 MPa Bulk Modulus 230 GPa Shear Modulus 20 GPa Young Modulus 329 GPa Poisson Ratio 0.31 Refractive Index N/A Speed of Sound 6190 m/s Thermal Conductivity 139 W/(m K) Thermal Expansion 4.8×10-6 K-1 Reactivity Valence 6 Electronegativity 2.16 ElectronAffinity 71.9 kJ/mol Ionization Energies 684.3, 1560, 2618, 4480, 5257, 6640.8, 12125, 13860, 15835, 17980, 20190, 22219, 26930, 29196, 52490, 55000, 61400, 67700, 74000, 80400, 87000 kJ/mol Health and Safety DOT Hazard Class 4.1 DOT Numbers 3089 RTECS Number RTECSQA4680000 NFPA Label

Classifications Alternate Names None Names of Allotropes None Block d Group 6 Period 5 Series Transition Metal Electron Configuration [Kr]5s14d5 Color Gray Discovery 1781 in Sweden Gas phase N/A CAS Number CAS7439-98-7 CID Number CID23932 RTECS Number RTECSQA4680000 Electrical properties Electrical Type Conductor Electrical Conductivity 2×107 S/m Resistivity 4.999999999997×10-8 m Ω Superconducting Point 0.915 Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 1.17×10-8 m3/Kg Molar Magnetic Susceptibility 1.122×10-9 m3/mol Volume Magnetic Susceptibility 0.0001203 Abundances % in Universe 5×10-7% % in Sun 9×10-7% % in Meteorites 0.00012% % in Earth's Crust 0.00011% % in Oceans 9.9×10-7% % in Humans 0.00001% Atomic dimensions and structure Atomic Radius 190 pm Covalent Radius 154 pm Van der Waals Radius N/A Crystal Structure Body-centered Cubic Lattice Angles π/2, π/2, π/2 Lattice Constants 314.7, 314.7, 314.7 pm Space Group Name Im_ 3m Space Group Number 229 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 7S3 Neutron Cross Section 2.6 Neutron Mass Absorption 0.0009 Known Isotopes 83Mo, 84Mo, 85Mo, 86Mo, 87Mo, 88Mo, 89Mo, 90Mo, 91Mo, 92Mo, 93Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo, 99Mo, 100Mo, 101Mo, 102Mo, 103Mo, 104Mo, 105Mo, 106Mo, 107Mo, 108Mo, 109Mo, 110Mo, 111Mo, 112Mo, 113Mo, 114Mo, 115Mo Stable Isotopes 92Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo Isotopic Abundances 100Mo 9.63% 92Mo 14.84% 94Mo 9.25% 95Mo 15.92% 96Mo 16.68% 97Mo 9.55% 98Mo 24.13%