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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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1861

Discovery of Thallium

Tl

Thallium, atomic number 81, has a mass of 204.384 au.

Thallium was first observed or predicted in 1861 by W. Crookes and first isolated in 1862 by C.-A. Lamy.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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