[Very Comprehensive data] Interactive periodic table. Includes additional information on ionisation energies, abundance, isotopes and reduction potentials.
[Basic data, includes printable version] Information on each of the chemical elements and data on their properties. Some site information is only in Czech language.
[Very comprehensive, includes very detailed write ups, basic nuclide data, extensive graphics] Professional scientists and students at school will all find something useful. Includes thousands of images relating to periodicity and structure.
[Very basic data, includes writeups, Requires Javascript]
[Detailed data, write-ups, basic listing of nuclides] The Royal Society of Chemistry's (in the UK) contribution to chemistry on the web.
[X-ray properties only] X-ray properties of most of the elements.
[Nuclide data only, extensive listing of nuclides] Provides isotope data for almost all known nuclides. From Berkeley Laboratory.
[Basic data, limited write-ups] Provides information on the 109 named elements plus elements 110 - 112.
[No element data] An auto-scored blank periodic table. The user fills it in online and the score is returned automatically.
[Very basic data, requires Adobe Acrobat Reader] PDF of the Periodic Table arranged in different formats. Files only contain elements' symbols, names and atomic number.
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