Periodic Table |
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| What is the Periodic Table Showing? | Periodicity |
The 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: Mark R. Leach Ph.D. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).
Periodic Tables from the year -300 :
| 300 BCE | Arsenic, Discovery of |
| Year: 300 BCE | PT id = 813, Type = element |
Discovery of Arsenic
As
Arsenic, atomic number 33, has a mass of 74.922 au.
Arsenic had its earliest use in about 300 BCE.
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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