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silvery white
General properties
Name, seembol, nummer lutetium, Lu, 71
Pronunciation /ljˈtʃiəm/
Element category lanthanide
sometimes considered a transeetion metal
Group, period, block n/a, 6, d
Staundart atomic wicht 174.9668(4)
Electron confeeguration [Xe] 6s2 4f14 5d1
2, 8, 18, 32, 9, 2
Electron shells of lutetium (2, 8, 18, 32, 9, 2)
Namin efter Lutetia, Laitin for: Paris, in the Roman era
Discovery Georges Urbain an Carl Auer von Welsbach (1906)
First isolation Carl Auer von Welsbach (1906)
Physical properties
Phase solid
Density (near r.t.) 9.841 g·cm−3
Liquid density at m.p. 9.3 g·cm−3
Meltin pynt 1925 K, 1652 °C, 3006 °F
Boilin pynt 3675 K, 3402 °C, 6156 °F
Heat o fusion ca. 22 kJ·mol−1
Heat o 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 orderin 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 hairdness 1160 MPa
Brinell hairdness 893 MPa
CAS registry nummer 7439-94-3
Most stable isotopes
Main article: Isotopes o lutetium
iso NA hauf-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 predictit, but hae nae yet been observed
· r

Lutetium is a chemical element wi the seembol Lu an atomic nummer 71. It is a sillery white metal which resists corrosion in dry, but nae in moist, air. It is the last element in the lanthanide series, an tradeetionally coontit amang the rare yirds.

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