The city of Atlanta, Georgia, in Fulton County, was an important rail and commercial center during the American Civil War. Although relatively small in population, the city became a critical point of contention during the Atlanta Campaign in 1864 when a powerful Union army approached from Union-held Tennessee.
Rare-earth compounds containing lanthanum are extensively used in carbon lighting applications, especially by the motion picture industry for studio lighting and projection.
There are 17 elements that are considered to be rare earth elementsâ15 elements in the lanthanide series and two additional elements that share similar chemical properties. They are listed below in order of atomic number (Z): Scandium or Sc (21). Scandium, a silvery-white metal, is a non-lanthanide rare earth.his silver-white metal is one of the most reactive rare earth elements. It is used to make special optical glasses, including infrared absorbing glass, camera and telescope lenses, and can also be used to make steel more malleable. Other applications for lanthanum include wastewater treatment and petroleum refining.