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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).

   Use the drop menus or search box (below) to Select or Search the 1400 entries in the database: 

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Periodic Tables from the year 1774 :

1774   Chlorine, Discovery of
1774   Manganese, Discovery of
Year:  1774 PT id = 796, Type = element

Discovery of Chlorine

Cl

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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Year:  1774 PT id = 805, Type = element

Discovery of Manganese

Mn

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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