What did Joseph-Louis Proust discover in regarding the atom?

Answer 1

Marcel Proust was a novelist, not a physicist. Joseph Proust was a French chemist who continued Lavoisier's (another French chemist who died in 1794 from radicals involved in the French Revolution) work. In 1799 Proust stated and proved the law of definite proportions (also called "Proust's Law"). This law soon helped John Dalton develop the law of multiple proportions. Always remember to specify which Proust you're talking about, because some people tend to think of Marcel(like I do) when they hear the name, (not to belittle Joseph), hence the first response to your query.

Answer 2

Joseph Louis Proust's contribution to atomic theory was the law of constant composition which he discovered in 1799. He showed that when chemical reactions occur, matter is not destroyed, nor is it created.

Answer 3

Joseph Louis Proust is the discoverer of the law of definite proportions: a chemical compound contain allways the same proportion of elements, by mass.

Now many exceptions from this law are known: the nonstoichiometric compounds.

Answer 4

Law of Definite Proportions (Law of Constant Composition) - A given compound always has the same elements in the same proportion by mass.

Answer 5

Joseph Priestley doesn't contribute to the atomic theory.

Answer 6

He discovered oxygen. I think?

Answer 7

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