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.

Lutetium, 71Lu
Template:Infobox element/symbol-to-top-image/alt
Lutetium
Pronunciation/ljˈtʃiəm/ (lew-TEE-shee-əm)
Appearancesilvery white
Standard atomic weight Ar, std(Lu)174.9668(1)[1]
Lutetium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Y

Lu

Lr
ytterbiumlutetiumhafnium
Atomic nummer (Z)71
Groupgroup n/a
Periodperiod 6
Blockd-block
Element category  Lanthanide
Electron confeeguration[Xe] 4f14 5d1 6s2
Electrons per shell2, 8, 18, 32, 9, 2
Pheesical properties
Phase at STPsolit
Meltin pynt1925 K ​(1652 °C, ​3006 °F)
Bylin pynt3675 K ​(3402 °C, ​6156 °F)
Density (near r.t.)9.841 g/cm3
when liquid (at m.p.)9.3 g/cm3
Heat o fusionca. 22 kJ/mol
Heat o vapourisation414 kJ/mol
Molar heat capacity26.86 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1906 2103 2346 (2653) (3072) (3663)
Atomic properties
Oxidation states0,[2] +1, +2, +3 waikly basic
ElectronegativityPauling scale: 1.27
Atomic radiusempirical: 174 pm
Covalent radius187±8 pm
Colour lines in a spectral range
Spectral lines o lutetium
Ither properties
Naitural occurrenceprimordial
Creestal structurhexagonal close-packed (hcp)
Hexagonal close packed creestal structur for lutetium
Thermal expansion(r.t.) (poly) 9.9 µm/(m·K)
Thermal conductivity16.4 W/(m·K)
Electrical resistivity(r.t.) (poly) 582 n Ω·m
Magnetic orderinparamagnetic[3]
Young's modulus68.6 GPa
Shear modulus27.2 GPa
Bulk modulus47.6 GPa
Poisson ratio0.261
Vickers haurdness1160 MPa
Brinell haurdness893 MPa
CAS Nummer7439-94-3
History
DiskiveryGeorges Urbain an Carl Auer von Welsbach (1906)
First isolationCarl Auer von Welsbach (1906)
Main isotopes o lutetium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
173Lu syn 1.37 y ε 173Yb
174Lu syn 3.31 y ε 174Yb
175Lu 97.41% - (α) 171Tm
176Lu 2.59% 3.78×1010 y β 176Hf
Decay modes in parentheses are predictit, but hae nae yet been observed
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ReferencesEedit

  1. Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
  2. Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017.
  3. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics (PDF). CRC press. 2000. ISBN 0849304814.