| atomic number | a soft silvery metallic element of the alkali earth group |
|---|---|
| atomic number | a white soft metallic element that tarnishes readily |
| atomic number | a ductile gray metallic element of the lanthanide series |
| atomic number | a soft yellowish-white trivalent metallic element of the rare earth group |
| atomic number | an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond |
| atomic number | a yellow trivalent metallic element of the rare earth group |
| atomic number | a soft silvery metallic element of the rare earth group having no stable isotope |
| atomic number | a gray lustrous metallic element of the rare earth group |
| atomic number | a bivalent and trivalent metallic element of the rare earth group |
| atomic number | a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group |
| atomic number | a metallic element of the rare earth group |
| atomic number | a trivalent metallic element of the rare earth group |