Question

What led to the failure of Dalton's atomic theory?

• A. Discovery of fundamental particle electron inside the atom
• B. Discovery of fundamental particle proton inside the atom
• C. Discovery of canal rays
• D. Both A and B

Answer 1

The correct option is D Both A and B

Dalton's atomic theory suggested that the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Daltons atomic theory.