- Rare-earth element - Wikipedia
The rare-earth elements (REE), also called the rare-earth metals or rare earths, and sometimes the lanthanides or lanthanoids (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), [1] are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals
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- What are rare earth elements, and why are they important?
The rare earth elements (REE) are a set of seventeen metallic elements These include the fifteen lanthanides on the periodic table plus scandium and yttrium Rare earth elements are an essential part of many high-tech devices The U S Geological Survey news release "Going Critical" explains:
- Rare Earth Elements - MIT
The rare earth elements (REEs) are comprised of the lanthanide elements plus scandium and yttrium, which have similar physical properties and are often found in the same ores and deposits
- Rare-earth element | Uses, Properties, Facts | Britannica
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])
- Rare-earth elements | U. S. Geological Survey - USGS. gov
The rare-earth elements (REEs) are 15 elements that range in atomic number from 57 (lanthanum) to 71 (lutetium); they are commonly referred to as the “lanthanides ”
- Rare Earth Elements - Department of Energy
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
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