| Name | Description | Type | Package | Framework |
| AlkaliEarthMetal | A class representing alkali earth metals. | Class | org.jscience.chemistry.elements | JScience |
| AlkaliMetal | A class representing alkali metals. | Class | org.jscience.chemistry.elements | JScience |
| Halogen | A class representing halogens. | Class | org.jscience.chemistry.elements | JScience |
| Metal | A class representing metals. | Class | org.jscience.chemistry.elements | JScience |
| NobleGas | A class representing noble gases. | Class | org.jscience.chemistry.elements | JScience |
| NonMetal | A class representing non-metals. | Class | org.jscience.chemistry.elements | JScience |
| RareEarthMetal | A class representing rare earth metals. | Class | org.jscience.chemistry.elements | JScience |
| TransitionMetal | A class representing transition metals. | Class | org.jscience.chemistry.elements | JScience |