1. Law of Multiple Proportions Lavoisier’s Experiment Cha rcoal

2. Oxides of Carbon Carbonic Acid Carbonic Oxide

3. John Dalton Elements Composed of indivisible atoms. Atoms are alike for a given element. Atoms for different elements differ in size, mass, etc. Compounds are formed from two or more atoms of different elements. Atoms combine is simple numerical ratios to form compounds. Dalton’s Atomic Theory Rule of Greatest Simplicity When atoms combine in only one ratio, "..it must be presumed to be a binary one, unless some cause appear to the contrary"

4. Dalton’s Atoms

5. Dalton’s Chemical Formulations Carbon Dioxide Carbon Monoxide

6. Nearly all the symbols suggested by Berzelius are in use today. At first symbols were not very popular among chemists. As late as 1837, Dalton complained that “Berzelius’ symbols are horrifying; a young student in chemistry might as well learn Hebrew as make himself acquainted with them. They appear like a chaos of atoms.. to equally perplex the adept of Science, to discourage the learner as well as to cloud the beauty of the Atomic Theory.” Berzellius’ Use of Symbols to Represent Atoms The Development of Modern Chemistry By Aaron J. Ihde

7. Chlorides of Iron Ferrous ChlorideFerric Chloride

8. Oxides of Hydrogen WaterHydrogen Peroxide