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: Dr Mark R Leach.
Use the buttons below to select from the 1000+ Periodic Tables in the database:
Discovery of Iron
Iron, atomic number 26, has a mass of 55.845 au.
Iron had its earliest use in about 5000 BCE, and the oldest sample dates from 4000 BCE from Egypt.
© Mark R. Leach 1999-
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