Question

What are the objections to Thomson's model of an atom?

Answer 1

Hint: Thomson’s atomic model was wrong because he assumed that the electrons would revolve in orbits around the nucleus in the sphere of positive charge. He compared his model to a watermelon or a plum pudding. The red part was compared to the positively charged sphere and the black seeds were the electrons.

Complete answer:
Thomson's model of an atom was not correct. He only states the terms protons and electrons appropriately. The objections/ drawbacks of Thomson's atomic model are as follows:
There was no valid experimental observation to the proposal put forth by Thomson.
The theory failed to explain how the positively charged protons hold the electrons in the atomic structure. So the stability of the atom was unknown.
It couldn’t give the position of the nucleus.
The model did not explain the scattering of alpha particles.
Thomson's model failed to explain the properties of proton and electron that were observed in the experiments performed.
In the sphere of an atom, the model regards both positive and negative charges as static. Charges that are opposite attract each other. As a result, the opposing charge will come closer and eventually demolish each other. Due to the forces of attraction among the opposing charges, such an atom will be unstable. To avoid such collisions and destruction, there must be space between the oppositely charged charges.

Note:
Although the Thomson model was not precise, it still formed a base for the development of the other atomic models. It also did not give any explanation for the photoelectric effect, radioactivity, wave nature of an electron, or the atomic spectra.