Bond Theory

Time Line

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

	1789	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

	1858	Mendeleev publishes his first Periodic Table.			1897	Thomson discovers the electron.			1911	Bohr proposes the planetary model for the hydrogen atom.			1923

Kekulé proposes the tetrahedral carbon atom which 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.