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Rare-earth elements occur in nature in combination with phosphate (monazite), carbonate - fluoride (bastnäsite), and oxygen anions. In their oxides, most rare-earth elements only have a valence of 3 and form sesquioxides (cerium forms CeO2).
A precise definition of rare earth elements (REEs) and in-depth discussion of how common REEs are, worldwide REE production, and current REE production. Portal for information on annual production, price, and use of rare earth elements since 1997, plus links to further information.
rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of elements below the main body of the periodic table (cerium [Ce] through lutetium [Lu]).
The rare earths are the lanthanides — lutetium and all 14 elements between lanthanum and ytterbium across one row of the periodic table — plus scandium and yttrium, which tend to occur in the...
Rare Earth Elements (REE) are becoming increasingly important in electronic devices used in the defense, alternative energy, and communications industries. Minable deposits of REEs are found in only a few locations.
Rare earth elements (REEs), which comprise of only 17 elements from the entire periodic table, play a critical role to our national security, energy independence, environmental future, and economic growth.
There are 17 rare earth elements on the periodic table, but a better name for them would be the "troublesome earths." Here's why.