Answer:John Dalton
Explanation:
He proposed the atomic theory in 1802 which states that
1.) All elements are made up of small,indivisible particles called atoms.
2.) Atoms can neither be created nor destroyed
3.) Atoms of the same element are alike in every aspect and differ from atoms of all other elements
4.)When atoms combine with other atoms they do so in simple ratios
5.) All chemical changes result from the combination or the separation of atoms.
