What did Dalton Contribute to the Understanding of the Atom Dalton’s atomic theory: On the basis of laws of chemical combination John Dalton, an English school teacher in Manchester, proposed that behaviour of matter could be explained using an atomic theory. He published his work about atomic theory in 1808. The main points of Dalton’s atomic theory are:All the matter … [Read more...] about What did Dalton Contribute to the Understanding of the Atom