Great Discoveries of Chemistry Timeline By Malachi Roldan 1770 Oxygen 1808 Atomic theory 1811 Atoms Combine Into Molecules 1828 Synthesis of Area 1850 Chemical Structure 1850 Atoms Have Signatures of Light 1860 Periodic Table of The Element 1869 Plastics 1885 Fullerenes 1900 Radioactivity 1913 Electrons For Chemical Bonds