It is simpler to say that 1 atom of hydrogen joins with 1 atom of chlorine to form 1 molecule of hydrogen chloride than it is to say that 1 gram of hydrogen reacts with 35.45 grams of chlorine to make 36.45 grams of hydrogen chloride. It was easier to express stoichiometric proportions in terms of atoms than in terms of absolute mass. Nevertheless atomic theory was useful, whether proven or not. Because atoms could not be seen, Dalton could not base his theory on direct observation, and this was a major stumbling block for many scientists. Humphry Davy (British, 1748–1829) and Claude-Louis Berthollet (French, 1748–1822) were not convinced. However, not everyone found this fact compelling. There was hard evidence in its favor conceiving of atoms in this way explained the stoichiometry of reactions, which posited that combined elements retained their proportions before, during, and after reacting with each other. The theory certainly had its early fans, including Swedish chemist Jöns Jakob Berzelius (1779–1848). Yet, an additional century would pass before atomic theory became universally accepted. It was 1808 when Dalton published the first volume of New Systems of Chemical Philosophy, which presented his atomic theory in full, but his ideas were in fact already known, as he had been talking and writing about them for at least five years. Dalton (1766–1844) proposed that all matter in the universe is made of indestructible, unchangeable atoms-each type characterized by a constant mass-that undergo chemical reactions by joining with and separating from each other. Many consider 2008 the 200th anniversary of atomic theory, John Dalton’s momentous theory of the nature of matter.
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