Template:Infobox lutetium

Lutetium,  ₇₁Lu

General properties
Name, symbol	lutetium, Lu
Appearance	silvery white
Pronunciation	/ljuːˈtiːʃiəm/ lew-TEE-shee-əm
Lutetium in the periodic table
Y ↑ Lu ↓ Lr ytterbium ← lutetium → hafnium
Atomic number (Z)	71
Group, block	group n/a, d-block
Period	period 6
Element category	lanthanide, sometimes considered a transition metal
Standard atomic weight (±) (Ar)	174.9668(1)
Electron configuration	[Xe] 6s2 4f14 5d1
per shell	2, 8, 18, 32, 9, 2
Physical properties
Phase	solid
Melting point	1925 K ​(1652 °C, ​3006 °F)
Boiling point	3675 K ​(3402 °C, ​6156 °F)
Density near r.t.	9.841 g/cm3
when liquid, at m.p.	9.3 g/cm3
Heat of fusion	ca. 22 kJ/mol
Heat of vaporization	414 kJ/mol
Molar heat capacity	26.86 J/(mol·K)
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 ​(a weakly basic oxide)
Electronegativity	Pauling scale: 1.27
Ionization energies	1st: 523.5 kJ/mol 2nd: 1340 kJ/mol 3rd: 2022.3 kJ/mol
Atomic radius	empirical: 174 pm
Covalent radius	187±8 pm
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Thermal expansion	poly: 9.9 µm/(m·K) (at r.t.)
Thermal conductivity	16.4 W/(m·K)
Electrical resistivity	poly: 582 nΩ·m (at r.t.)
Magnetic ordering	paramagnetic
Young's modulus	68.6 GPa
Shear modulus	27.2 GPa
Bulk modulus	47.6 GPa
Poisson ratio	0.261
Vickers hardness	755–1160 MPa
Brinell hardness	890–1300 MPa
CAS Number	7439-94-3
History
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 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

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