Lutetium therapy, lutetium (Lu), chemical element, a rare-earth metal of the lanthanide series of the periodic table, that is the densest and the highest-melting rare-earth element and the last member of the lanthanide series. Lutetium is a chemical element; it has symbol Lu and atomic number 71. Lutetium is little used outside research. One of its few commercial uses is as a catalyst for cracking hydrocarbons in oil refineries. In common with many other lanthanides, the main source of lutetium is the mineral monazite. Lutetium, the last member of the lanthanide series in the periodic table, is a rare earth element known for its unique properties and applications in various high-tech and scientific fields. In its pure form, lutetium metal is silvery white and stable in air. . Lutetium has no known biological role. Lutetium is a chemical element; it has symbol Lu and atomic number 71. It has low toxicity. It is a silvery white metal, which resists corrosion in dry air, but not in moist air.


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