Lutetium

Lutetium
Properties
Atomic symbol	Lu
Atomic number	71
Classification	Metallic
Atomic mass	174.967 amu
Other Information
Date of discovery	1907
Name of discoverer	Georges Urbain, Carl Auer von Welsbach and Charles James
Name origin	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 from	Found with ytterbium in gadolinite and xenotime. Its chief ores are monazite and bastnasite.

Lutetium is the hardest and densest of the rare-earth metals.