September 6, 1776. - July 26, 1844.
Dalton's theory is that all matter is made of atoms. You can not see atoms and they can not be destroyed. All atoms of an element are the same in mass and properties. Compounds are made up of more than two different kinds of atoms. A chemical reaction is where the atoms move around.
Decribtion of Daltons model
Daltons model was very plane, just a simple circle. There are no positively charged nucleus or negatively charged electrons. Just a plane atom.