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    Medieval alchemy

    The elemental system used in medieval alchemy was developed primarily by the Persian or Arab alchemist Jābir ibn Hayyān and was rooted in the classical elements of Greek tradition. His system consisted of the four Aristot… See more

    17th and 18th centuries: Early chemistry

    Practical attempts to improve the refining of ores and their extraction to smelt metals was an important source of information for early chemists in the 16th century, among them Georg Agricola (1494–1555), who published h… See more

    19th century

    Throughout the 19th century, chemistry was divided between those who followed the atomic theory of John Dalton and the energeticists, such as Wilhelm Ostwald and Ernst Mach. Although such proponents of the atomic t… See more

    20th century

    In 1903, Mikhail Tsvet invented chromatography, an important analytic technique. In 1904, Hantaro Nagaoka proposed an early nuclear model of the atom, where electrons orbit a dense massive nu… See more

    Mathematics and chemistry

    Before the 20th century, chemistry was defined as the science of the nature of matter and its transformations. It was therefore distinct from physics which was not concerned with such dramatic transformat… See more

    Scope of chemistry

    As understanding of the nature of matter has evolved, so too has the self-understanding of the science of chemistry by its practitioners. This continuing historical process of evaluation includes the categories, … See more

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