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Discovery of Oxygen
Joseph Priestly discovers oxygen. -
Elecricity Transforms Chemicals
Humphry Davy finds electricity transforms and changes the properties of chemicals. -
Atomic Theory
John Dalton discovers how to link atoms to quantities like a gas. His theory says elements are created out of atoms. -
Atoms Combine Into Molecules
Amedeo Avogadro discovers atoms combine to make molecules. -
Synthesis of Urea
Friedrich Woehler synthesizes urea from non-organic materials. It is discovered that some substances created by living things can be recreated using nonliving materials. -
Chemical Structure
Friedrich Kekule discovers chemical structure and studies into this field become prioritized. -
Atoms have Signatures of Light
Gustav Kirchhoff and Robert Bunsen find that elements absorb light at specific wavelengths. -
Periodic Table of Elements
Dmitry Mendeleyev realizes that arranging elements by atomic weight also classifies them by other properties. He creates the first table of elements and predicts other elements that will be discovered. -
Radiactivity
Marie and Pierre Curie discover radioactivity. Radium and Polonium are discovered. -
Electrons
J.J. Thompson discovers electrons, although they are known as "corpuscles" when he names them. -
Electrons for Chemical Bonds
Niels Bohr publishes a model in which electrons orbit around an atom. -