Daltons list of atomic weights & symbols

Daltons list of atomic weights & symbols

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This image is part of the feature Top Ten Scientists

Credit: SCIENCE PHOTO LIBRARY

Caption: John Dalton's table of atomic weights and the symbols he used for a number of "elements". Compiled in 1808, some of the 20 substances included in the table are compounds & not pure elements: lime, for example. Dalton calculated the weight of each substance relative to hydrogen, the lightest, ending his list with mercury, to which he had incorrectly assigned a greater atomic weight than for lead. Dalton's view of each element consisting of a unique type of indivisible atom was consistent with contemporary observations & "laws" concerning the combination of elements to form compounds.

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Keywords: apparatus, atomic weight, chemical, chemistry, dalton, dalton table, dalton's table of, elements, equipment, historical, history of science, table of elements, technology

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