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Oxygen Discovered
Joseph Priestly first discovered oxygen -
Electricity Transforms Chemicals
Humphry Davy -
Atomic Theory
John Dalton discovered the Atomic Theory -
Atoms Combine into Molecules
Italian chemist Amedeo Avogadro finds atoms in elements form into molecules -
Synthesis of Urea
Friedrich Woehler accidentally synthesizes urea from inorganic material -
Chemical Structure
Friedrich Kekule figures out the chemical structure of benzene -
Radioactivity
Marie and Pierre Curie discover and isolate radioactive materials -
The Electron
J.J. Thomson discovers that the negatively charged particles -
Electrons form Chemical Bonds
Niels Bohr publishes his model of atomic structure -
Periodic Table
Dmitry Mendeleyev