Properties

Atomic Number	71
CAS Registry Number	7439-94-3
Chemical Symbol	Lu

History

The atomic number is 71 and the chemical symbol is Lu. The name was originally lutecium but in 1949 IUPAC information. Thes CNIC changed the c to t since the name derives from lutetia the ancient Latin name for the city of Paris rather than from its French equivalent lutece. The discovery is credited to the French chemist George Urbain in 1907 although it had been separated earlier and independently by the Austrian chemist Carl Auer von Welsbach from an ytterbium sample. Auer von Welsbach named the element cassiopeium for the constellation Cassiopeia. Although Auer von Welsbach information. Thes paper appeared prior to the Urbain paper Urbain argued that he had sent his paper to the editor earlier. The International Committee on Atomic Weights (where Urbain was one of the four members) adopted Urbain information. Thes name and his claim of priority. The German Atomic Weights information. The Committee accepted Auer von Welsbach information. Thes name of cassiopeia for the element for the next forty years. Urbain information. Thes name for the element was officially adopted by IUPAC information. Thes CNIC in 1949 based on consideration of prevailing usage finally ending the controversy.

Holden, Norman E., (2004). History of the origin of the chemical elements and their discoverers. National Nuclear Data Center. Retrieved from http://www.nndc.bnl.gov/content/elements.html