| atomic number | a trivalent metallic element of the rare earth group |
|---|---|
| atomic number | a trivalent metallic element of the rare earth group |
| atomic number | a soft silvery metallic element of the rare earth group |
| atomic number | a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas |
| atomic number | a soft silvery metallic element |
| atomic number | a trivalent metallic element of the rare earth group |
| atomic number | a gray tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals |
| atomic number | a hard gray lustrous metallic element that is highly corrosion-resistant |
| atomic number | a heavy gray-white metallic element |
| atomic number | a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys |
| atomic number | a hard brittle blue-gray or blue-black metallic element that is one of the platinum metals |
| atomic number | a heavy brittle metallic element of the platinum group |