Question

WHY THOMSON ATOMIC MODEL WAS FAILED?

WHAT ARE THE DRAW BACKS OF RUTHERFORD'S ATOMIC MODEL?

Answer 1

Thomson’s atomic model explained the overall neutrality of an atom. Its assumption that the total mass of an atom is uniformly distributed all over the atom was inconsistent with some of the experimental results. Rutherford’s gold foil experiment of scattering α-particles revealed that most of the space in an atom is empty contradicted Thomson’s atomic model. Thus, it was found that the plum pudding atomic model was insufficient to explain the structure of an atom. Rutherford draw backs : the nucleus and electrons are held by electrostatic attractions generally electrostatic attractions leads to fusion so electrons will finally fall into nucleus which was not satisfactory hope u understood

Answer 2

JJ THOMPSONS gives his first atomic model and that was very popular at that time but later on it was failed when Rutherford's alpha particles scattering expt. Comes.

I paste an image see there

According to atom is made up of positive sphere and electrons are embedded on it.

WHEN Rutherford passes alpha rays from Gold foil he observed that 99.9% rays are passes through the foil.

Here the point comes

IF Thompson model was correct then alpha rays reflects back because atom have positive charge as well as alpha rays also have positive charge then it will repal.

Hence he concluded that Thompson model of atom is wrong and then he discovered nucleus.

HOPE YOU UNDERSTAND why he failed..