What idea compromised the acceptance of Dalton work?

John Dalton's atomic theory was initially compromised by the idea of indivisible atoms, as later discoveries revealed that atoms are not the smallest units of matter and can be further divided into subatomic particles (protons, neutrons, and electrons). Additionally, Dalton's assumption that all atoms of a given element are identical in mass and properties was challenged by the discovery of isotopes, which have varying masses. These advancements in chemistry and physics ultimately led to a more nuanced understanding of atomic structure.