The century’s progress in chemistry

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19th century Amedeo Avogadro Atomic theory Chemical elements Chemistry, Physical and theoretical Chemists G. (Gustav) Kirchhoff Gas laws (Physical chemistry) History JÃ¶ns Jakob, friherre Berzelius John Dalton John William Draper Joseph Louis Gay-Lussac Justus Freiherr von Liebig Louis Jacques MandÃ© Daguerre Portraits R. (Robert) Bunsen Research Spectroscope