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The Greeks thought simular to this but only divided it up into four groups. Their theory was close to Boyle's but Boyle had a more concise idea of these elements and by the end of the 1700's they had discovered about 30 elements.
In 1972 Frenchman Antoine Laurent Lavoisier discover the no mater what happens a substance always has the same weight. In the late 1700's another Frenchman, Proust, discovert that elements can be combined to make different compounds, and that certain proportions had to be used. This became know as "law of definite proportions".
A few years later an English chemist, John Dalton, a fan of Boyle worked on Proust's theory and came up with "the law of multiple proportions"...
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