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atomic weight
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Key People

Jöns Jacob Berzelius
Jöns Jacob Berzelius
Swedish chemist
John Dalton
John Dalton
British scientist
Stanislao Cannizzaro
Italian chemist
Amedeo Avogadro
Amedeo Avogadro
Italian physicist
Auguste Laurent
French chemist
Jean-Baptiste-André Dumas, engraving, 1879
Jean-Baptiste-André Dumas
French chemist
Lothar Meyer
German chemist
Johann Wolfgang Döbereiner
German chemist
William Prout
British chemist
Theodore William Richards
American chemist
Jean-Charles Galissard de Marignac
Swiss chemist