67 sites in Periodic Table
Table of the Nuclides
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[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.
http://atom.kaeri.re.kr/
WebElements
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[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.
http://www.webelements.com/
See also
The category Periodic Table in other languages