Question

what is wrong in Dalton's atomic theory

Answer 1

it does not clearly make the atomic theory visible.

Answer 2

The indivisibility of an atom was explained incorrectly: an atom can be farther subdivided into protons, neutrons, and electrons. Nevertheless, an atom is the tiniest particle that takes an active part in chemical reactions. According to Dalton, the atoms of the identical element are alike in all respects.