Periodic Table |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
| 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).
| Year: 1816 | PT id = 1400, Type = structure weight |
Prout's Hypothesis
Prout’s hypothesis, Annals of Philosophy, vol. 7, 1816
In his 1816 Annals of Philosophy paper, William Prout proposed that the atomic weights of all elements are exact integer multiples of hydrogen's weight. He suggested hydrogen was the fundamental "protyle", or building block, of all matter, a hypothesis that, despite challenges from fractional measurements, anticipated the concept of atomic composition via protons and neutrons. Prout's hypothesis remained influential in chemistry throughout the early 1800s.
Read more in Wikipedia and Scientist of The Day.

![]() |
![]() |
![]() |
| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
Queries, Suggestions, Bugs, Errors, Typos...
If you have any:
Queries
Comments
Suggestions
Suggestions for links
Bug, typo or grammatical error reports about this page,please contact Mark R. Leach, the author, using mark@meta-synthesis.com
This free, open access web book is an ongoing project and your input is appreciated.






