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Chemistry: Challenges and Solutions

Origins of Chemical Theory (animation)

Historians often trace the origins of chemical theory back to the 5th century BCE, when the Greek philosopher, Democritus, claimed that all matter was composed of small, indivisible particles that he called “atomos.” While very different from our current view of the atom, Democritus gets credit for the first atomic theory.

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Chemistry: Challenges and Solutions


Produced by the Harvard-Smithsonian Center for Astrophysics. 2014.
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