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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 1803:

1803   Dalton's Postulates About The Elements
1803   Discovery of Palladium
1803   Discovery of Cerium
1803   Discovery of Osmium
1803   Discovery of Iridium

Year:  1803 PT id = 4

Dalton's Postulates About The Elements

Around the year 1803 in Manchester, John Dalton gave a series of lectures in which he presented his postulates:

From a very early notebook from around this time:

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Year:  1803 PT id = 826

Discovery of Palladium


Palladium, atomic number 46, has a mass of 106.42 au.

Palladium was first isolated in 1803 by H. Wollaston.

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Year:  1803 PT id = 838

Discovery of Cerium


Cerium, atomic number 58, has a mass of 140.116 au.

Cerium was first observed or predicted in 1803 by H. Klaproth, J. Berzelius, and W. Hisinger and first isolated in 1838 by G. Mosander.

Chronology of chemically the splitting of ceria (mixed oxides) into the pure rare-earth metals:

From: CRC Handbook on the Physics and Chemistry of Rare Earths, Chapter 248. Accommodation of the Rare Earths in the Periodic Table: A Historical Analysis
by Pieter Thyssen and Koen Binnemans (ISBN: 978-0-444-53590-0)

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Year:  1803 PT id = 856

Discovery of Osmium


Osmium, atomic number 76, has a mass of 190.23 au.

Osmium was first isolated in 1803 by S. Tennant.

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Year:  1803 PT id = 857

Discovery of Iridium


Iridium, atomic number 77, has a mass of 192.217 au.

Iridium was first isolated in 1803 by S. Tennant.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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