Dalton emphasized the idea of the divisibility of matter, which he transformed from a philosophical concept into a scientific theory. He proposed that the smallest particles of matter are atoms.
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British chemist John Dalton provided the basic theory about the nature of matter following the formulation of the Law of Constant Proportions.
The Law of Constant Proportions, also known as the Law of Definite Proportions, was stated by Joseph Proust. It asserts that in a chemical substance, the elements are always present in definite proportions by mass.