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Technical data for Lutetium

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Overview
NameLutetium
SymbolLu
Atomic Number71
Atomic Weight174.967
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
Heat of CombustionN/A
Specific Heat154 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity16 W/(m K)
Thermal Expansion9.9×10-6 K-1

Bulk physical properties
Density9.841 g/cm3
Density (Liquid)9.3 g/cm3
Molar Volume0.000017779
Brinell Hardness893 MPa
Mohs HardnessN/A
Vickers Hardness1160 MPa
Bulk Modulus48 GPa
Shear Modulus27 GPa
Young Modulus69 GPa
Poisson Ratio0.26
Refractive IndexN/A
Speed of SoundN/A
Thermal Conductivity16 W/(m K)
Thermal Expansion9.9×10-6 K-1

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

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class4.1
DOT Numbers3089
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group3
Period6
Electron Configuration[Xe]4f145d16s2
ColorSilver
Discovery
1907 in France and Germany
Gas phaseN/A
CAS NumberCAS7439-94-3
CID NumberCID23929
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.8×106 S/m
Resistivity5.6×10-7 m Ω
Superconducting Point0.1

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

Abundances
% in Universe1×10-8%
% in Sun1×10-7%
% in Meteorites2.9×10-6%
% in Earth's Crust0.000056%
% in Oceans1.5×10-11%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius217 pm
Covalent Radius160 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 Section84
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:

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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