<P> The law of definite proportions contributed to , and was placed on a firm theoretical basis by , the atomic theory that John Dalton promoted beginning in 1803 , which explained matter as consisting of discrete atoms , that there was one type of atom for each element , and that the compounds were made of combinations of different types of atoms in fixed proportions . </P>
<P> The law of definite proportions contributed to , and was placed on a firm theoretical basis by , the atomic theory that John Dalton promoted beginning in 1803 , which explained matter as consisting of discrete atoms , that there was one type of atom for each element , and that the compounds were made of combinations of different types of atoms in fixed proportions . </P>
when was the law of definite proportions developed
when was the law of definite proportions developed
1803
1803