Any element of the lanthanide series (atomic numbers 57 through 71)
English: rare earth, rare-earth element, lanthanoid, lanthanide, lanthanon
lanthanoidEnglish
lanthanide, lanthanoid, lanthanon, rare-earth element, rare earth
lanthanide, lanthanoid, lanthanon, rare-earth element, rare earth
English: rare earth, rare-earth element, lanthanoid, lanthanide, lanthanon