LANTHANIDES Synonyms

• a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic

• a trivalent metallic element of the rare earth group; occurs with yttrium

• a bivalent and trivalent metallic element of the rare earth group

• a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group

• a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds

• a trivalent metallic element of the rare earth group; usually occurs in association with yttrium

• a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium

• a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process

• a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium

• a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite

• a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite

• a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

• a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime

• any element of the lanthanide series (atomic numbers 57 through 71)

• any element of the lanthanide series (atomic numbers 57 through 71)

• any element of the lanthanide series (atomic numbers 57 through 71)

• a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth

• any element of the lanthanide series (atomic numbers 57 through 71)