In an article he wrote for the Manchester Literary and Philosophical Society in 1803, Dalton created the first chart of atomic weights. Seeking to expand on his theory, he readdressed the subject of atomic weight in his book A New System of Chemical Philosophy, published 1808. read more
Quick Answer. John Dalton discovered that elements are only able to combine atomically when they are in fixed ratios. This discovery led to the basis for Dalton's Atomic Theory. read more