John Dalton, English Chemist

John Dalton (1766-1844), English chemist, meteorologist and physicist. Though he is best known for his pioneering work in the development of modern atomic theory he began a meteorological diary in 1787 in which he entered more than 200,000 observations. In the early 1800's he began his life's work culminating in his atomic theory that consists of five main points; 1) elements are made of extremely small particles called atoms, 2) atoms of a given element are identical in size, mass, and other properties, thus atoms of different elements differ in size, mass, and other properties, 3) atoms cannot be subdivided, created, or destroyed, 4) atoms of different elements combine in simple whole-number ratios to form chemical compounds, and 5) in chemical reactions, atoms are combined, separated, or rearranged.

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