Question

Why is Thomson's model of an atom compared with watermelon ?

Answer 1

In the year 1900, William Thomson proposed the Thomson atomic model. This model theoretically described the description of an atom's interior structure. Sir Joseph Thomson, who had discovered the electron earlier, was a fervent supporter.

Complete answer:
J.J. Thomson found a negatively charged particle during a cathode ray tube experiment. In the year 1897, this experiment was carried out. A vacuum tube is a cathode ray tube. An electron was the name given to the negative particle.
Thomson thought that an electron was 2,000 times lighter than a proton and that each atom was made up of thousands of electrons. He regarded atoms surrounded by a cloud with both positive and negative charges in this atomic structure model. He and Rutherford also worked together to demonstrate the ionisation of air using X-rays. They were the first to show it off. The atom in Thomson's model resembles a plum pudding.
The first postulate states that an atom is made up of a positively charged sphere with electrons contained within it.
Postulate 2: Because the negative and positive charges are of equal size, an atom is electrically neutral as a whole.
Watermelon is compared to the Thomson atomic model. Where he thought about:
Seeds from watermelon are negatively charged particles.
The watermelon's red portion is positively charged.
Limitations-
Because his atom model failed to explain how a positive charge binds the negatively charged electrons in an atom, it failed to explain atomic stability. As a result, this hypothesis failed to account for the nucleus' location in an atom.
The dispersion of alpha particles by thin metal foils was not explained by Thomson's model.
There is no experimental data to back it up.

Note:
It serves as a foundation for the creation of additional atomic models. Here's a link to a pdf of the atomic structure. The study of the atom and its structure has opened the way for a slew of innovations that have aided humanity's progress.