Extended Periodic Table
- http://www.apsidium.com/
- [Very basic data] Predicted periodic table for undiscovered elements with atomic number greater than 118. Theoretical discussion and Orbital freeware available.
Periodic Table
- http://center.acs.org/periodic/tools/PT.html
- [Detailed data] American Chemical Society's periodic table with visual electronic configurations and interactive plots of physical and chemical properties. Requires Flash.
Periodic Table of Elements
- http://atlas.chemistry.uoc.gr/ptoe/
- [Detailed] Includes general information about an element, atomic number and weight, shells and filling orbital, melting and boiling point, covalent and atomic radius, and lots of other parameters.
Table of the Nuclides
- http://atom.kaeri.re.kr/
- [Nuclide data only, very extensive listing of nuclides] Map of all known nuclides, with their atomic mass, radioactive decay modes and half-lives, and related information. Brookhaven National Laboratory.
The 'Periodic Table' Table
- http://theodoregray.com/PeriodicTable
- [Basic data] Based on a wooden 'periodic table' table. Contains photographs of over 200 element samples, with descriptions, experiments, and stories about many of them. Winner of the 2002 Ig Nobel prize in Chemistry.
The Elements and Isotopes
- http://www.infini-t.com
- The Elements and Isotopes is a comprehensive application that will display information from the Periodic Table and the Table of the Isotopes.