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:
Wollaston's Physical Slide Rule of Chemical Equivalents
From the Science Museum in the UK collection, the Wollaston slide rule of chemical equivalents:
Wollaston uses a decimal scale in which oxygen is defined as having an atomic weight (relative atomic mass) of 10.00 rather than the modern value of 15.999.
Mark Leach writes:
© Mark R. Leach 1999-
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