Posted by Sue on Tuesday, November 4, 2008 at 6:36pm.
Dalton's Atomic Theory was based on experimental evidence which lead to the laws of definite and multiple proportions. You may want to research that and other experimental evidence that supports the atomic theory. You will find a lot more about the development of the atomic theory from ancient times through the discovery of the parts of the atom here:
http://www.infoplease.com/ce6/sci/A0856763.html
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