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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).

   Use the drop menus or search box (below) to Select or Search the 1400 entries in the database: 

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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.

 

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© Mark R. Leach Ph.D. 1999 –


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