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Jan 1, 1220
Robert Grosseteste lays out the first documented early framwork of the scientific method in his publications
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Jan 1, 1530
Paracelsus develops the study of iatrochemistry
Image CitationCitationIt is a branch of Alchemy devoted to extending life. -
Jean Beguin publishes an early chemistry textbook,and in it creates the first chemical equation.
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Torricelli, Evangelista invented the mercury barometer.
Image Citation[Citation](Torricelli, Evangelista (1643)Invented the mercury barometer. ) -
Lavoisier, A.L. discovers Nitrogen
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Dalton, John proposed atomic theory based upon measurable masses
[Citation](Dalton, John (1766-1844)Proposed atomic theory based upon measurable masses ) -
Rutherford publishes atomic theory
CitationHe described the atom as having a positive nucleus surrounded by negative orbiting electrons. This model suggested that most of the mass of the atom was contained in the nucleus -
Niels Bohr creates his own model of atomic structure in which he applies the quantum theory
Image CitationCitationBohr's model suggested that electrons orbited around the nucleus and greatly determined an atoms chemical properties. He also assumed that electrons traveled in stationary orbits defined by their angular momentum from the quantum theory. -
John Thomson discovers electrons
Image CitationCitationHe discoved electrons and determined that all mater contained them.
