lutetium

Name lutetium
Symbol Lu
Atomic Weight 174.967
Atomic Number 71
CAS ID 7439-94-3
Group Number 3
Group Name (none)
Period Number 6
Origin of Name From the Latin, Lutetia = "Paris."
Year Discovered 1907
Discovery Credits Discovered by G. Urnain at Paris, France, and independently by C. James at the University of New Hampshire, USA.
Class Metallic
Color Silvery White
Standard State Solid at 77 F & 298 K
Description Hardest, densest, and one of the rarest of the lanthanide metals. Little used except in research.

Diagnostic tests: 
There are no simple diagnostic tests to identify lutetium.
X-ray fluorescence spectroscopy is commonly employed to identify and analyze members of the Rare-Earth group elements.

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