| atomic number | a heavy precious metallic element |
|---|---|
| atomic number | a soft yellow malleable ductile (trivalent and univalent) metallic element |
| atomic number | a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas |
| atomic number | a heavy silvery toxic univalent and bivalent metallic element |
| atomic number | a soft gray malleable metallic element that resembles tin but discolors on exposure to air |
| atomic number | a soft heavy toxic malleable metallic element |
| atomic number | a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically) |
| atomic number | a radioactive metallic element that is similar to tellurium and bismuth |
| atomic number | a highly unstable radioactive element (the heaviest of the halogen series) |
| atomic number | a radioactive gaseous element formed by the disintegration of radium |
| atomic number | a radioactive element of the alkali-metal group discovered as a disintegration product of actinium |
| atomic number | an intensely radioactive metallic element that occurs in minute amounts in uranium ores |