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lutetium |
2 definitions found From WordNet r 1.6 [wn]: lutetium n : a trivalent metallic element of the rare earth group usually occurs in association with yttrium [syn: {lutecium}, {Lu}, {atomic number 71}] From Elements database 20001107 [elements]: lutetium Symbol: Lu Atomic number: 71 Atomic weight: 194.967 Silvery-white rare-earth metal which is relatively stable in air. It happens to be the most expensive rare-earth metal. Its found with almost all rare-earth metals, but is very difficult to separate from other elements. Least abundant of all natural elements. Used in metal alloys, and as a catalyst in various processes. There are two natural, stable isotopes, and seven radioisotopes, the most stable being Lu-174 with a half-life of 3.3 years. The separation of lutetium from {ytterbium} was described by Georges Urbain in 1907. It was discovered at approximately the same time by Carl Auer von Welsbach. The name comes from the Greek word lutetia which means Paris.
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