lutetiumn.
/l(j)uːˈtiːʃɪəm/, /l(j)uːˈtiːsɪəm/, U.S. /lʊˈtiʃ(i)əm/ Chemistry.
A rare metallic element that is the heaviest member of the lanthanide series and forms colourless salts in which it is trivalent. Atomic number 71; symbol Lu.
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Lu1907
lutetium1907
cassiopeium1908
1907 Jrnl. Chem. Soc. 92 ii. 956 (heading) A new element: lutecium, resulting from the decomposition of Marignac's ytterbium.
1911 Encycl. Brit. XXVIII. 942/2 In 1907 G. Urbain separated ytterbium into two new elements, neoytterbium and lutecium (atomic weight, 174·0).
1922 Nature 17 June 781/1 The oxides of lutecium and ytterbium in a preparation of Urbain's were attached to the anticathode.
1929 Encycl. Brit. XIV. 490/2 Lutecium occurs along with ytterbium, erbium, etc., in the minerals gadolinite, euxenite, xenotime, etc. It is separated from the other members of the group by the fractional crystallization of the bromates, lutecium bromate being the most soluble passes into the mother-liquor.
1939 Physical Rev. 56 21 The half-life of the natural radioactivity of lutecium..is..7·3±2 × 1010 years for Lu176, which probably is the active isotope.
1952 Chem. & Engin. News 7 July 2843/2 The table of international atomic weights, as published by the ‘Comptes Rendus’ of the New York meeting of the Union for 1951..shows changes in the weights of seven elements... Lutetium replaces lutecium, to agree with the original Latin spelling Lutetia..instead of the French Lutèce.
1973 J. J. Lagowski Mod. Inorg. Chem. xvi. 604 Lutetium, the first element which follows the lanthanides, starts the last d-series, but it forms a M3+ cation with a filled 4f orbital. Thus, lutetium on the basis of its atomic and ionic radii also appears to be a member of the lanthanide series.
This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022).
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n.1907