Question 1 Describe Thomson's model of an atom? Question 2 Which subatomic particle was not present in Thomson's model of an atom? Question 3 Why Thomson's model is called as Plum pudding model of an atom? Structure of an atom Dalton atomic theory suggested that atoms are indivisible(could not be broken into smaller particles) But the discovery of subatomic … [Read more...] about J.J. Thomson model of an atom