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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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1782

Discovery of Tellurium

Te

Tellurium, atomic number 52, has a mass of 127.6 au.

Tellurium caused great difficulty to the chemists who first tried to develop a periodic table, because it has an atomic weight greater than iodine (126.9). Mendeleev prioritised chemical properties over the anomalous atomic weight data, and correctly classified Te along with O, S, & Se. It was only when nuclear structure and the importance of atomic number was recognised, around 1918, that the issue was explained.

Tellurium was first isolated in 1782 by F.-J.M. von Reichenstein.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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