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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 1300 Period Tables in the database: 

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Periodic Tables from the year 1782:

1782   de Morveau's Table of Chemically Simple Substances
1782   Discovery of Tellurium

Year:  1782 PT id = 297

de Morveau's Table of Chemically Simple Substances

de Morveau's table of chemically simple substances (updated with modern representations by Mazurs):

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Year:  1782 PT id = 832

Discovery of Tellurium


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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