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Joseph Priestly discovers oxygen.
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Humphry Davy finds electricity transforms and changes the properties of chemicals.
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John Dalton discovers how to link atoms to quantities like a gas. His theory says elements are created out of atoms.
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Amedeo Avogadro discovers atoms combine to make molecules.
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Friedrich Woehler synthesizes urea from non-organic materials. It is discovered that some substances created by living things can be recreated using nonliving materials.
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Friedrich Kekule discovers chemical structure and studies into this field become prioritized.
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Gustav Kirchhoff and Robert Bunsen find that elements absorb light at specific wavelengths.
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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.
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Marie and Pierre Curie discover radioactivity. Radium and Polonium are discovered.
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J.J. Thompson discovers electrons, although they are known as "corpuscles" when he names them.
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Niels Bohr publishes a model in which electrons orbit around an atom.
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