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The element also has 42 nuclear isomers, with masses of 150, 151, 153–162, 166–180 (not every mass number corresponds to only one isomer).The most stable of them are lutetium-177m, with half-life of 160.4 days and lutetium-174m, with half-life of 142 days; this is longer than half-lives of the ground states of all radioactive lutetium isotopes, except only for lutetium-173, 174, and 176.The soluble salts, such as nitrate, sulfate and acetate form hydrates upon crystallization.The oxide, hydroxide, fluoride, carbonate, phosphate and oxalate are insoluble in water.Lutetium, derived from the Latin Lutetia (Paris), was independently discovered in 1907 by French scientist Georges Urbain, Austrian mineralogist Baron Carl Auer von Welsbach, and American chemist Charles James.Both of these articles accused the other man of publishing results based on those of the author.Lutetium occurs on the Earth in form of two isotopes: lutetium-175 and lutetium-176.
Lutetium is sometimes considered the first element of the 6th-period transition metals, although lanthanum is more often considered as such.
Lutetium was independently discovered in 1907 by French scientist Georges Urbain, Austrian mineralogist Baron Carl Auer von Welsbach, and American chemist Charles James.
All of these researchers found lutetium as an impurity in the mineral ytterbia, which was previously thought to consist entirely of ytterbium.
Lutetium usually occurs in association with the element yttrium and is sometimes used in metal alloys and as a catalyst in various chemical reactions.
When entering a chemical reaction, the atom loses its two outermost electrons and the single 5d-electron.