Template:Infobox lutetium

Lutetium,  ₇₁Lu

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery white
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Lutetium in the periodic table
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Atomic number (Z)	71
Group	Template:Infobox element/group
Period	period 6
Block	f-block
Element category	Template:Infobox element/category format, sometimes considered a transition metal
Electron configuration	[Xe] 4f14 5d1 6s2
Electrons per shell	2, 8, 18, 32, 9, 2
Physical properties
Phase at STP	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
[[Enthalpy of vaporization|Heat of Template:Engvar]]	414 kJ/mol
Molar heat capacity	26.86 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 1.27
[[Ionization energy|Template:Engvar 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
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
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	Carl Auer von Welsbach and Georges Urbain (1906)
First isolation	Carl Auer von Welsbach (1906)
Named by	Georges Urbain (1906)
Main isotopes of lutetium
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