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{{Element | name=Lutetium | symbol=Lu | anumber=71 | amass=174.967 amu | state=Solid | class=Metallic | cstructure=Hexagonal| color=silvery white | date=1907 | discname=Georges Urbain, Carl Auer von Welsbach and Charles James | origname=From ''Lutetia'', the ancient name of Paris. | uses=Used in alloys and can be used as a catalyst in cracking, hydrogenation, polymerization and alkylation. It's primary use is in chemical research. | obtained=Found with [[ytterbium]] in [[gadolinite]] and [[xenotime]]. Its chief ores are [[monazite]] and [[bastnasite]]. }}

{{Element | name=Lutetium | symbol=Lu | anumber=71 | amass=174.967 amu | state=Solid | class=Rare Earth | cstructure=Hexagonal| density=9.840 g/cm^3 | color=silvery white | stableisotopes=2 | date=1907 | discname=Georges Urbain, Carl Auer von Welsbach and Charles James | origname=From ''Lutetia'', the ancient name of Paris. | uses=Used in alloys and can be used as a catalyst in cracking, hydrogenation, polymerization and alkylation. It's primary use is in chemical research. | obtained=Found with [[ytterbium]] in [[gadolinite]] and [[xenotime]]. Its chief ores are [[monazite]] and [[bastnasite]]. }}

'''Lutetium''' is the hardest and densest of the rare earth [[metal]]s.

'''Lutetium''' is the hardest and densest of the rare earth [[metal]]s.  It has two stable isotopes (actually one, but another one has a [[half-life]] of over 10¹⁰ years).

 

Lutetium was discovered in 1907 by Georges Urbain and others, after being separated from ytterbium.  This brought to a close a long period of confusion about whether the (very similar) elements ytterbium, terbium, and erbium were different, and which one was which.

[[Category:Elements]]

[[Category:Elements]]