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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: 

  Text Search:       

Year:  1772 PT id = 787

Discovery of Nitrogen


Nitrogen, atomic number 7, has a mass of 14.007 au.

Nitrogen exists as a diatomic molecular gas, N2, and in this form it makes up about 78% of the atmosphere by volume. The element seemed so inert that Lavoisier named it azote, meaning "without life".

Nitrogen was first isolated in 1772 by D. Rutherford.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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