Answer: Option (a) is the correct answer.
Explanation:
J.J. Thomson is a renowned scientist who discovered the model of atom which is known as the plum pudding model.
Through this model Thomson stated that an atom consists of small particles. These small particles are positive and negative charges present inside an atom.
Whereas Democritus stated that an atom is indivisible and thus he proposed the indivisible atom model.
Ernest Rutherford discovered that an atom has lot of empty space and this space is nucleus. As he stated that positively charged particles are known as protons which are present inside a nucleus.
Rutherford's gold foil experiment discovered that an atom has nucleus in which most of the mass of an atom is concentrated.
Thus, we can conclude that the plum pudding model was proposed as a result of J. J. Thomson’s work.
