Thomson visualized electrons as currants in a Christmas pudding or seeds in a watermelon, studded within the positively charged sphere of the atom.
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Thomson compared the distribution of positive charge in the atom to the red edible part of a watermelon, spread throughout the sphere.
The discovery of electrons and protons inside the atom led to the failure of Dalton’s idea of atomic indivisibility.
Dalton’s idea was challenged by the discovery of electrons and protons inside the atom.
If electrons in atoms were to continuously lose energy and spiral into the nucleus, atoms would be highly unstable and matter as we know it wouldn’t exist.