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| What is the Periodic Table Showing? | Periodicity |
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. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).
Periodic Tables from the year 1789 :
| 1789 | Lavoisier's Table of Simple Substances |
| 1789 | Zirconium, Discovery of |
| 1789 | Uranium, Discovery of |
| Year: 1789 | PT id = 3, Type = formulation early |
Antoine Lavoisier
Antoine Lavoisier produced a list chemical substances, that included the 23 known elements. He also refined the concept as before this time, metals - with the exception of mercury - were not considered to be elements. Wikipedia.
A list of 33 simple substances compiled by Lavoisier, from Traité Élémentaire de Chimie, Cuchet, Paris, 1789, p. 192:
From Peter van der Krogt's Elementymology & Elements Multidict web site:
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| Year: 1789 | PT id = 820, Type = element |
Discovery of Zirconium
Zr
Zirconium, atomic number 40, has a mass of 91.224 au.
Zirconium was first observed or predicted in 1789 by H. Klaproth and first isolated in 1824 by J. Berzelius.
| Year: 1789 | PT id = 872, Type = element |
Discovery of Uranium
U 
Uranium, atomic number 92, has a mass of 238.029 au.
Radioactive element with a very long half-life.
Uranium was first observed or predicted in 1789 by H. Klaproth and first isolated in 1841 by E.-M. Péligot.
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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