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Technical data for Lutetium

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Overview
NameLutetium
SymbolLu
Atomic Number71
Atomic Weight174.9668
Density9.841 g/cm3
Melting Point1663 °C
Boiling Point3402 °C

Thermal properties
PhaseSolid
Melting Point1663 °C
Boiling Point3402 °C
Absolute Melting Point1936 K
Absolute Boiling Point3675 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion22 kJ/mol
Heat of Vaporization415 kJ/mol
Specific Heat154 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity16 W/(m K)
Thermal Expansion0.00001 K-1

Bulk physical properties
Density9.841 g/cm3
Density (Liquid)9.3 g/cm3
Molar Volume0.000017779
Brinell Hardness893 MPa
Mohs Hardness2.6[note]
Vickers Hardness1160 MPa
Bulk Modulus48 GPa
Shear Modulus27 GPa
Young Modulus67 GPa
Poisson Ratio0.26
Refractive IndexN/A
Speed of SoundN/A
Thermal Conductivity16 W/(m K)
Thermal Expansion0.00001 K-1

Reactivity
Valence3
Electronegativity1.27
ElectronAffinity50 kJ/mol
Ionization Energies
523.5, 1340, 2022.3, 4370, 6445 kJ/mol

Health and Safety
DOT Hazard Class
4.1
DOT Numbers3089
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group3
Period6
SeriesTransition Metal
Electron Configuration[Xe]6s24f145d1
ColorSilver
Discovery
1907 in France and Germany
Gas phaseN/A
CAS NumberCAS7439-94-3
CID Number
CID23929
RTECS NumberN/A

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.8×106 S/m
Resistivity5.7×10-7 m Ω
Superconducting Point0.1

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility1.2×10-9 m3/Kg
Molar Magnetic Susceptibility2.1×10-10 m3/mol
Volume Magnetic Susceptibility0.0000118

Abundances
% in Universe1×10-8%
% in Sun1×10-7%
% in Meteorites2.9×10-6%
% in Earth's Crust0.000057%
% in Oceans1.5×10-11%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius217 pm
Covalent Radius187 pm
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
350.31, 350.31, 555.09 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers2D3/2
Neutron Cross Section85
Neutron Mass Absorption0.022
Known Isotopes
150Lu, 151Lu, 152Lu, 153Lu, 154Lu, 155Lu, 156Lu, 157Lu, 158Lu, 159Lu, 160Lu, 161Lu, 162Lu, 163Lu, 164Lu, 165Lu, 166Lu, 167Lu, 168Lu, 169Lu, 170Lu, 171Lu, 172Lu, 173Lu, 174Lu, 175Lu, 176Lu, 177Lu, 178Lu, 179Lu, 180Lu, 181Lu, 182Lu, 183Lu, 184Lu
Stable Isotopes
175Lu
Isotopic Abundances
175Lu97.41%
176Lu2.59%


Notes on the properties of Lutetium:

Mohs Hardness: converted from Vickers scale

Specific Heat: Value given for solid phase.

Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc.

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