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Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps. It is also used in the flint (actually ferrocerium) of lighters.
Lanthanum or La (57). This 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.candium, a silvery-white metal, is a non-lanthanide rare earth. It is used in many popular consumer products, such as televisions and fluorescent or energy-saving lamps. In industry, the primary use of scandium is to strengthen metal compounds.