Name erbium
Symbol Er
Atomic Weight 167.259
Atomic Number 68
CAS ID 7440-52-0
Group Number (none)
Group Name Lanthanoid
Period Number 6
Origin of Name Named after Ytterby, Sweden.
Year Discovered 1842
Discovery Credits Discovered by C. G. Mosander at Stockholm, Sweden.
Class Metallic
Color Silvery white
Standard State Solid at 77 F & 298 K
Description Silver-gray metal of the rare earth group. slowly tarnishes in air, slowly reacts with water, dissolves in acids. Used in infrared absorbing glass, alloys with titanium.

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

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