Technical data for Yttrium

Overview Name Yttrium Symbol Y Atomic Number 39 Atomic Weight 88.90584 Density 4.472 g/cm3 Melting Point 1526 °C Boiling Point 3345 °C Thermal properties Phase Solid Melting Point 1526 °C Boiling Point 3345 °C Absolute Melting Point 1799 K Absolute Boiling Point 3618 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 11.4 kJ/mol Heat of Vaporization 380 kJ/mol Specific Heat 298 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 17 W/(m K) Thermal Expansion 0.0000106 K-1 Bulk physical properties Density 4.472 g/cm3 Density (Liquid) 4.24 g/cm3 Molar Volume 0.000019881 Brinell Hardness 588 MPa Mohs Hardness N/A Vickers Hardness N/A Bulk Modulus 41 GPa Shear Modulus 26 GPa Young Modulus 64 GPa Poisson Ratio 0.24 Refractive Index N/A Speed of Sound 3300 m/s Thermal Conductivity 17 W/(m K) Thermal Expansion 0.0000106 K-1 Reactivity Valence 3 Electronegativity 1.22 ElectronAffinity 29.6 kJ/mol Ionization Energies 600, 1180, 1980, 5847, 7430, 8970, 11190, 12450, 14110, 18400 kJ/mol Health and Safety DOT Hazard Class 4.1 DOT Numbers 3089 RTECS Number RTECSZG2980000 NFPA Label

Classifications Alternate Names None Names of Allotropes None Block d Group 3 Period 5 Series Transition Metal Electron Configuration [Kr]5s24d1 Color Silver Discovery 1794 in Finland Gas phase N/A CAS Number CAS7440-65-5 CID Number CID23993 RTECS Number RTECSZG2980000 Electrical properties Electrical Type Conductor Electrical Conductivity 1.8×106 S/m Resistivity 5.7×10-7 m Ω Superconducting Point 1.3 Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 6.66×10-8 m3/Kg Molar Magnetic Susceptibility 5.921×10-9 m3/mol Volume Magnetic Susceptibility 0.0002978 Abundances % in Universe 7×10-7% % in Sun 9.9×10-7% % in Meteorites 0.00019% % in Earth's Crust 0.0029% % in Oceans 1.3×10-9% % in Humans N/A Atomic dimensions and structure Atomic Radius 212 pm Covalent Radius 190 pm Van der Waals Radius N/A Crystal Structure Simple Hexagonal Lattice Angles π/2, π/2, 2 π/3 Lattice Constants 364.74, 364.74, 573.06 pm Space Group Name P63/mmc Space Group Number 194 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 2D3/2 Neutron Cross Section 1.28 Neutron Mass Absorption 0.00059 Known Isotopes 76Y, 77Y, 78Y, 79Y, 80Y, 81Y, 82Y, 83Y, 84Y, 85Y, 86Y, 87Y, 88Y, 89Y, 90Y, 91Y, 92Y, 93Y, 94Y, 95Y, 96Y, 97Y, 98Y, 99Y, 100Y, 101Y, 102Y, 103Y, 104Y, 105Y, 106Y, 107Y, 108Y Stable Isotopes 89Y Isotopic Abundances 89Y 100%