The INTERNET Database of Periodic Tables
There are hundreds of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.
From The Scientific American in 1866, an article by John Draper concerning "The Spectroscope and Its Revelations".
At the time there was no understanding how the spectra were generated but it was recognised that every element produced a unique spectrum:
© Mark R. Leach 1999-
Queries, Suggestions, Bugs, Errors, Typos...
If you have any:
This free, open access web book is an ongoing project and your input is appreciated.
counter started in 2011