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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 Tables from the year 1774:

1774   Discovery of Chlorine
1774   Discovery of Manganese


Discovery of Chlorine


Chlorine, atomic number 17, has a mass of 35.452 au.

Chlorine exists as a green diatomic molecular gas, Cl2.

Chlorine was first isolated in 1774 by W. Scheele.

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Discovery of Manganese


Manganese, atomic number 25, has a mass of 54.938 au.

Manganese was first observed or predicted in 1774 by W. Scheele and first isolated in 1774 by G. Gahn.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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