Technical data for Lutetium

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
Heat of Fusion22 kJ/mol
Heat of Vaporization415 kJ/mol
Heat of CombustionN/A
Specific Heat154 J/(kg K)[note]
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
Vickers Hardness1160 MPa
Bulk Modulus48 GPa
Shear Modulus27 GPa
Young Modulus69 GPa
Poisson Ratio0.26
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

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blockd
Group3
Period6
Electron Configuration[Xe]4f145d16s2
ColorSilver
Discovery
1907 in France and Germany
Gas phaseN/A
CAS NumberCAS7439-94-3

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

Magnetic properties
Magnetic TypeN/A
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
Stable Isotopes
175Lu
Isotopic Abundances
175Lu97.41%
176Lu2.59%

Notes on the properties of Lutetium:
Specific Heat: Value given for solid phase.