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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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Periodic Table formulations from the year 1782:

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


1782

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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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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