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The INTERNET Database of Periodic Tables

There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D.

Use the drop menus below to search & select from the more than 1100 Period Tables in the database:

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Segrè Chart of Elements & Isotopes

The Segrè chart of elements and isotopes arranges atomic nuclei by numbers or protons and numbers of neutrons and is a table of nuclides. There are various ways the axes can be arranged. From elsewhere in this chemogenesis web book:

And from Wikipedia:

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© Mark R. Leach Ph.D. 1999 –

Queries, Suggestions, Bugs, Errors, Typos...

If you have any:

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please contact Mark R. Leach, the author, using mark@meta-synthesis.com

This free, open access web book is an ongoing project and your input is appreciated.