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The History of the Periodic Table
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The History of the Periodic Table Things are different from each other, and each can be reduced to very small parts of itself. - Ancient knowledge This was noticed early by people, and Greek thinkers, about 400BC, used the words "element', and `atom' to describe the differences and smallest parts of matter. These ideas survived for 2000 years while concepts such as `Elements' of Earth, Fire, Air, and Water to explain `world stuff' came and went. Much later, Boyle, an experimenter like Galileo and Bacon, and who was influenced much by Democritus, Gassendi, and Descartes, lent important weight to the atomic theory of matter in the 1600s. It was Lavoisier who divided the few elements known in the 1700's into four classes, and then John Dalton made atoms even more convincing, suggesting that the mass of an atom was it's most important property. "The chemical elements are composed of... indivisible particles...
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