[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.
[Basic data] All data including electron configuration on one page, available as PDF, PNG, and HTML.
[Detailed information on each element, no write-ups]
[Basic data] Interactive periodic table. Including uses and discovery.
[Basic data, requires JavaScript] Includes historical information about the elements in Italian, but the table itself is in English.
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.
[Very basic data] Minimalist table that provides symbols, atomic numbers, and atomic weight with four significant figures.
[Detailed data]
Explains the origins of the names of the chemical elements and lists element names in scores of languages.
[Very basic date, requires VRML] Visual representations of the Bohr model of the atom in 3D.
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