| carbon | (n) an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds, Syn. C, atomic number 6 | | dysprosium | (n) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic, Syn. Dy, atomic number 66 | | erbium | (n) a trivalent metallic element of the rare earth group; occurs with yttrium, Syn. atomic number 68, Er | | europium | (n) a bivalent and trivalent metallic element of the rare earth group, Syn. Eu, atomic number 63 | | gadolinium | (n) a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group, Syn. atomic number 64, Gd | | holmium | (n) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds, Syn. atomic number 67, Ho | | neodymium | (n) a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium, Syn. Nd, atomic number 60 | | promethium | (n) 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, Syn. Pm, atomic number 61 | | samarium | (n) a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite, Syn. Sm, atomic number 62 | | terbium | (n) a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite, Syn. atomic number 65, Tb | | thulium | (n) 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, Syn. atomic number 69, Tm |
| | carbon | (n) an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds, Syn. C, atomic number 6 | | dysprosium | (n) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic, Syn. Dy, atomic number 66 | | erbium | (n) a trivalent metallic element of the rare earth group; occurs with yttrium, Syn. atomic number 68, Er | | europium | (n) a bivalent and trivalent metallic element of the rare earth group, Syn. Eu, atomic number 63 | | gadolinium | (n) a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group, Syn. atomic number 64, Gd | | holmium | (n) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds, Syn. atomic number 67, Ho | | neodymium | (n) a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium, Syn. Nd, atomic number 60 | | promethium | (n) 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, Syn. Pm, atomic number 61 | | samarium | (n) a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite, Syn. Sm, atomic number 62 | | terbium | (n) a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite, Syn. atomic number 65, Tb | | thulium | (n) 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, Syn. atomic number 69, Tm |
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