Lutetium

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Lutetium,  71Lu
Lutetium sublimed dendritic and 1cm3 cube.jpg
General properties
Appearance silvery white
Staundart atomic wecht (Ar, staundart) 174.9668(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
Group group n/a
Period period 6
Element category   lanthanide
Block d-block
Electron confeeguration [Xe] 6s2 4f14 5d1
Electrons per shell
2, 8, 18, 32, 9, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1925 K ​(1652 °C, ​3006 °F)
Bylin pynt 3675 K ​(3402 °C, ​6156 °F)
Density (near r.t.) 9.841 g/cm3
when liquid (at m.p.) 9.3 g/cm3
Heat o fusion ca. 22 kJ/mol
Heat o vapourisation 414 kJ/mol
Molar heat capacity 26.86 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 states

3, 2, 1

(weakly basic oxide)
Electronegativity Pauling scale: 1.27
Atomic radius empirical: 174 pm
Covalent radius 187±8 pm
Color lines in a spectral range
Miscellanea
Creestal structurhexagonal close-packed (hcp)
Hexagonal close packed creestal structur for lutetium
Thermal expansion (r.t.) (poly) 9.9 µm/(m·K)
Thermal conductivity 16.4 W/(m·K)
Electrical resistivity (r.t.) (poly) 582 n Ω·m
Magnetic orderin paramagnetic[1]
Young's modulus 68.6 GPa
Shear modulus 27.2 GPa
Bouk modulus 47.6 GPa
Poisson ratio 0.261
Vickers haurdness 1160 MPa
Brinell haurdness 893 MPa
CAS Nummer 7439-94-3
History
Diskivery Georges Urbain an Carl Auer von Welsbach (1906)
First isolation Carl 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
| references | in Wikidata

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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