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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 hold information on periodic tables, the discovery of the elements and elucidation of atomic weights (and more).

Use the drop menus or search box (below) to search & select from the more than 1350 Period Tables in the database: 

  Search by Text String:       

Periodic Tables from the year 1807:

1807   Sodium, Discovery of
1807   Potassium, Discovery of
Year:  1807 PT id = 790, Type = element

Discovery of Sodium

Na

Sodium, atomic number 11, has a mass of 22.99 au.

Sodium is a Group 1 element, and these are often referred to as the "alkali metals".

Sodium was first isolated in 1807 by H. Davy.

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Year:  1807 PT id = 799, Type = element

Discovery of Potassium

K

Potassium, atomic number 19, has a mass of 39.098 au.

Potassium is a Group 1 element, and these are often referred to as the "alkali metals".

Potassium was first isolated in 1807 by H. Davy.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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