praseodymium

Name praseodymium
Symbol Pr
Atomic Weight 140.90765
Atomic Number 59
CAS ID 7440-10-0
Group Number
Group Name Lanthanoid
Period Number 6
Origin of Name Greek, prasios didymos = "green twin"
Year Discovered 1885
Discovery Credits Separated by Baron Auer von Welsbach at Vienna, Austria.
Class Metallic
Color Silvery White, Yellowish Tinge
Standard State Solid at 77 F & 298 K
Description Soft, malleable, silvery metal of the lanthanide group. Reacts slowly with oxygen, rapidly with water. Used in alloys for permanent magnets, flints, yellow glass for eye protection for welders, etc.

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

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