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Lutetium

Metalsolid
Symbol: Lu
Atomic number: 71
Atomic mass: 174.967
Group: Transition Metal
CAS-number: 7439-94-3

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 9, 2
Orbitals: [Xe] 4f14 5d1 6s2
Electronegativity: --, 1.1
1. Ionization potential: 5.4259 eV
2. Ionization potential: 13.888 eV
3. Ionization potential: 20.957 eV
Oxidation states: 3
Electrical conductivity: 0.0185 10^6
Melting point: 1663 °C
Boiling point: 3402 °C
Specific heat: 0.15 J/gK
Heat of fusion: 18.60 kJ/mol
Heat of vaporization: 355.90 kJ/mol
Thermal conductivity: 0.164 W/cmK
Atomic radius: 2.25 Å
Ionic radius: 0.98 Å (+3)
Covalent radius: 1.56 Å
Atomic volume: 17.78 cm³/mol
Density (293 K): 9.85 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
173Lu 0 173 7/2 1.37y EC View
174Lu 0 174 1 3.3y EC, β+ View
174Lum 0 174 6 142d IT, EC View
175Lu 97.41 174.941 7/2 -- --
176Lu 2.59 175.943 7 3.6E10y β- View
177Lu 0 177 7/2 6.68d β- View
177Lum 0 177 23/2 160.7d β-, IT View

Other info

Name origin:Named for the ancient name of Paris, Lutecia.
Description:Silvery-white, hard, dense, rare earth metal.
Discovered by:Georges Urbain
Year:1907
Place:France
Sources:Found with ytterbium in gadolinite and xenotime. Usually obtained from monazite sand which is often 50% rare earth by mass and 0.003% lutetium.
Use(s):It has no practical applications.