| David's Whizzy Periodic Table | | Applet-based table with visualizations of the electron shell model, the nucleus, the visual emission spectrum, and energy levels of the electrons. Also has interesting facts about each element represented. |
| eFunda: Periodic Table | | [Basic data] Interactive periodic table. Includes electrical resistivity, vaporization enthalpy and heat capacity. |
| EnvironmentalChemistry.com: Periodic Table of Elements | | [Very comprehensive data, write-ups, extensive listing of nuclides] Data on elements includes scores of properties, element names in a dozen languages and almost all known nuclides. Environmental chemistry articles round out site. |
| Exploring the Table of Isotopes | | [Nuclide data only, extensive listing of nuclides] Provides isotope data for almost all known nuclides. From Berkeley Laboratory. |
| Extended Periodic Table | | [Very basic data] Predicted periodic table for undiscovered elements with atomic number greater than 118. Theoretical discussion and Orbital freeware available. |
| Infoplease.com: Periodic Table | | An interactive periodic table with information about each element including the symbol, boiling point, melting point, discoverer and origin. |
| Interactive Periodic Table | | Easily visualize relative differences between elements by dynamically coloring table (and generating graphs) based on elements attributes. | |
|