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 Oxygen
Oxygen, atomic number 8, has a mass of 15.999 au.
Oxygen exists as a diatomic molecular gas, O2; in this form it makes up about 20% of the atmosphere.
Oxygen was first isolated in 1771 by W. Scheele.
© Mark R. Leach 1999-
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