cerium

Name cerium
Symbol Ce
Atomic Weight 140.116
Atomic Number 58
CAS ID 7440-45-1
Group Number (none)
Group Name Lanthanoid
Period Number 6
Origin of Name Named after the asteroid Ceres, discovered in 1801
Year Discovered 1803
Discovery Credits Discovered by J. J. Berzelius and W. Hisinger at Vestmanland, Sweden. First isolated by W. F. Hillebrand and T. H. Norton in 1875 at Washington, DC, USA
Class Metallic
Color Silvery white
Standard State Solid at 77 F & 298 K
Description Reactive, gray metal, most abundant of the (Rare Earth) lanthanide metals. Tarnishes in air, burns when heated, reacts rapidly with water, dissolved in acids. Used in glass, gas mantles, ceramics, and alloys. Misch alloy ( predominantly Ce) is used for lighter "flints".

Diagnostic tests: 
There are no simple diagnostic tests to identify cerium.
Infusible cerium minerals glow with exaggerated incandescence in the flame test (along with Sr, Mg, Zr, Zn, Ca - the "lime light effect").

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