Name ytterbium
Symbol Yb
Atomic Weight 173.04
Atomic Number 70
CAS ID 7440-64-4
Group Number
Group Name Lanthanoid
Period Number 6
Origin of Name Named after Ytterby, Sweden.
Year Discovered 1878
Discovery Credits Discovered by J. C. G. De Marignac at Geneva, Switzerland.
Class Metallic
Color Silvery White
Standard State Solid at 77 F & 298 K
Description Soft, silvery-white metal of the lanthanide (rare earth) group. Slowly oxidized by air, reacts with water. Some use in stress gauges.

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

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