The definitive online periodic table reference site including technical data, and photographs and descriptions of thousands of samples of the chemical elements.
http://periodictable.com/ - Visit
Periodic Tables
Here is our collection of periodic table resources online. If you know of a good site that should be in our collection, please, let us know so we can add it!
Ptable.com – Interactive Periodic Table
Ptable is an interactive Web 2.0 periodic table with dynamic layouts showing names, electrons, oxidation, trend visualization, orbitals, isotopes, search. Full descriptions.
http://www.ptable.com/ - Visit
ChemicalElements.com – Interactive Periodic Table
Chemical Elements is an up-to-date periodic table with detailed but easy to understand information on each of the elements, presented in interactive HTML.
http://www.chemicalelements.com/ - Visit
Wikipedia: Periodic Table
Wikipedia has an extensive page on the periodic table with detailed sections on the history, structure, alternative versions of the periodic table, classifications including groups, periods, blocks, periodicity of chemical properties and trends.
http://en.wikipedia.org/wiki/Periodic_table - Visit