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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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1940

Discovery of Astatine

At

Astatine, atomic number 85, has a mass of 210 au.

Radioactive element.

Astatine was first observed or predicted in 1940 by R. Corson, R. MacKenzie and E. Segrè.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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