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| Lavoisier publishes his Traité élémentaire de chimie. | 1803 |
Berzelius advances his electrochemical theory of Dualism. | 1828 |
After studying substituted organics, Dumas rejects dualistic theories | 1840's |
Frankland publishes a paper which leads to the concept of valence | |||||||
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Dalton records the first table of relative atomic weights in his notebook. |  1812 |
Dumas and Boullay advance first radical theory of organic compounds. | 1838 |
Period of chaos in chemistry. | 1852 |
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| Kekulé proposes the tetrahedral carbon atom that can link with other carbon atoms. | 1869  |
Werner proposes new structures for coordination compounds. | 1897 |
Rutherford proposes the nuclear model for the atom. | 1913 |
Lewis's book, Valence and the Structure of Atoms and Molecules is published. | |||||||
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1858 |
Mendeleev publishes his first Periodic Table. | 1893 |
Thomson discovers the electron. | 1911 |
Bohr proposes the planetary model for the hydrogen atom. | 1923 |
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