The INTERNET Database of Periodic Tables
|2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I|
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.
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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