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Chronicles the historical development of the concept of an "element" from the ideas of ancient Greece through modern quantum theory. Viewers learn that scientists like Boyle, Dalton, and Lavoisier began to recognize patterns in the behavior of chemicals, they sought a unifying principle that would explain why different elements had different properties. See how Mendeleev sorted through a mountain of data, looking for a logical organization, and learn how he was able to predict the properties of elements years before they were even discovered.