John+Dalton+B5

[] =**John Dalton**=

By Michael and Larry B5

English meteorologist who switched to chemistry. He lived for 1766-1844 (about 78years). He was born to a was to a modest Quaker family in Cumberland, England He proposed the //Atomic Theory// in 1803 which stated that all matter was composed of small indivisible particles (atoms), of a given element possess unique characteristics and weight. He proposed the there are three different types of atoms exist: simple (elements), compound (simple molecules), and complex (complex molecules). Dalton's theory was presented in New System of Chemical Philosophy for about 19 years(1808-1827). His work identified chemical elements as a specific type of atom, therefore rejecting Newton's //Theory of Chemical Affinities//.