Template:Infobox lutetium

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Lutetium (lanthanide)
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Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Ununtrium (unknown chemical properties)
Flerovium (unknown chemical properties)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)


Lutetium in the periodic table
silvery white
General properties
Name, symbol, number lutetium, Lu, 71
Pronunciation /ljˈtʃiəm/
Element category lanthanide
sometimes considered a transition metal
Group, period, block n/a, 6, d
Standard atomic weight 174.9668(4)
Electron configuration [Xe] 6s2 4f14 5d1
2, 8, 18, 32, 9, 2
Physical properties
Phase solid
Density (near r.t.) 9.841 g·cm−3
Liquid density at m.p. 9.3 g·cm−3
Melting point 1925 K, 1652 °C, 3006 °F
Boiling point 3675 K, 3402 °C, 6156 °F
Heat of fusion ca. 22 kJ·mol−1
Heat of vaporization 414 kJ·mol−1
Molar heat capacity 26.86 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1906 2103 2346 (2653) (3072) (3663)
Atomic properties
Oxidation states 3, 2, 1

(weakly basic oxide)

Electronegativity 1.27 (Pauling scale)
Ionization energies 1st: 523.5 kJ·mol−1
2nd: 1340 kJ·mol−1
3rd: 2022.3 kJ·mol−1
Atomic radius 174 pm
Covalent radius 187±8 pm
Crystal structure hexagonal close-packed
Lutetium has a hexagonal close packed crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (r.t.) (poly) 582 nΩ·m
Thermal conductivity 16.4 W·m−1·K−1
Thermal expansion (r.t.) (poly) 9.9 µm/(m·K)
Young's modulus 68.6 GPa
Shear modulus 27.2 GPa
Bulk modulus 47.6 GPa
Poisson ratio 0.261
Vickers hardness 1160 MPa
Brinell hardness 893 MPa
CAS registry number 7439-94-3
Naming after Lutetia, Latin for: Paris, in the Roman era
Discovery Georges Urbain and Carl Auer von Welsbach (1906)
First isolation Carl Auer von Welsbach (1906)
Most stable isotopes
Main article: Isotopes of lutetium
iso NA half-life DM DE (MeV) DP
173Lu syn 1.37 y ε 0.671 173Yb
174Lu syn 3.31 y ε 1.374 174Yb
175Lu 97.41% - (α) 1.6197 171Tm
176Lu 2.59% 3.78×1010 y β 1.193 176Hf
Decay modes in parentheses are predicted, but have not yet been observed
· references


  1. ^ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics. CRC press. 2000. ISBN 0849304814.