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In was in 1799 that Joseph Proust discovered the law of definite proportions, or Proust's Law. Proust was a French chemist.
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what year was it discover
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what year did L. Von Brady discover hydrogen
The 20th century
In the year 1620
He didn't discover them. But he sailed there in 1492.
2999
in 1895
In 1772
1856