A group of elements that include SCANDIUM; YTTRIUM; and the LANTHANOID SERIES ELEMENTS. Historically, the rare earth metals got their name from the fact that they were never found in their pure elemental form, but as an oxide. In addition, they were very difficult to purify. They are not truly rare and comprise about 25% of the metals in the earth's crust.

Annotation

general or unspecified; prefer specifics

obecné, dej přednost přesnějšímu deskriptoru

DUI

D008674 MeSH Browser

CUI

M0013519

Previous indexing

Metals (1966-1975)

History note

76; was NON MESH before 1976

Public note

76