The main points of Dalton's atomic theory were: Elements are made of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed. read more
John Dalton was born on September 6, 1766 into a Quaker family in Eaglesfield in Cumberland, England and died on July 27, 1844. read more
John Dalton developed his atomic theory in the early 1800's. He developed a good theory, but he didn't really discover the atom. read more