Question

In your own words, explain how Dalton's theory of atoms helped in the development of the modern atomic theory.

Answer 1

I believe Dalton theorized that atoms were discrete units (meaning you can't usually pull them apart) that consisted of a positive center and some negative bits floating around (the protons and electrons).

Answer 2

well, he introduced the theory that said that elements are differed due to the mass of their atoms.
This theory is used to make the periodic table that we can see today. I think that is enough reason how Dalton helped the development of modern atomic theory

hope this helps