Rare-earth element

Any of the fifteen lanthanides plus scandium and yttrium

Rare-earth element: Any of the fifteen lanthanides plus scandium and yttrium The rare-earth elements (REE), also called the rare-earth metals or rare earths, and sometimes the lanthanides or lanthanoids, are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals. Compounds containing rare earths have diverse applications in electrical and electronic components, lasers, glass, magnetic materials, and industrial processes.

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