dysprosium

Name dysprosium
Symbol Dy
Atomic Weight 162.50
Atomic Number 66
CAS ID 7429-91-6
Group Number (none)
Group Name Lanthanoid
Period Number 6
Origin of Name Greek, dysprositos = "hard to obtain."
Year Discovered 1886
Discovery Credits Discovered by Paul-Emile Lecoq de Boisbaudran at Paris, France.
Class Metallic
Color Silvery white
Standard State Solid at 77 F & 298 K
Description Reactive, hard, silvery metal of the rare earth group. Oxidized by oxygen, reacts rapidly with water, dissolves in acids. Used in alloys for making magnets.

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

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