The INTERNET Database of Periodic Tables
|2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I|
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.
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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