Internet Database of Periodic Tables
There are thousands 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.
Use the buttons below to select from the 1000+ Periodic Tables in the database:
From Scientific American in 1866, an article by Henry 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. Over 35,000 stars are catalogued/identified by their "HD" [Henry Draper] numbers:
© Mark R. Leach 1999-
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This free, open access web book is an ongoing project and your input is appreciated.