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Lutetium, 71 Lu Lutetium Pronunciation (lew-TEE -shee-əm ) Appearance silvery white Standard atomic weight A r, std (Lu) 7002174966800000000♠ 174.9668(1)[1] Mass number Lu: Lutetium in the periodic cairt
Atomic nummer (Z ) 71 Group group n/a Period period 6 Block d-block Element category Lanthanide Electron confeeguration [Xe ] 4f14 5d1 6s2 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 0,[2] +1, +2, +3 waikly basic Electronegativity Pauling scale: 1.27 Atomic radius empirical: 174 pm Covalent radius 187±8 pm Spectral lines o lutetiumIther properties Naitural occurrence Lu: Primordial Creestal structur hexagonal close-packed (hcp) 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 [3] Young's modulus 68.6 GPa Shear modulus 27.2 GPa Bulk 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
Decay modes in parentheses are predictit, but hae nae yet been observed | references
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 .
↑ 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 .
↑ 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 .
↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics (PDF) . CRC press. 2000. ISBN 0849304814 .