J.J. Thomson proposed his atom model in 1898. 1. Explain Thomson’s

1.	J.J. Thomson proposed his atom model in 1898. 1. Explain Thomson’s model of atom. 2. Why Thomson’s atom model is called plum pudding model or watermelon model? 3. What is the limitation of Thomson’s atom model?
Answer» 1. J.J. Thomson proposed that an atom possess a spherical shape in which the positive charge is uniformly distributed. The electrons are embedded into it in such a manner as to give the most stable electrostatic arrangement. The mass of the atom is assumed to be uniformly distributed over the atom. This model explained the overall neutrality of the atom. 2. Thomson’s model of atom can be visualised as a pudding or watermelon of positive charge with electrons embedded into it like the plums or seeds. 3. Thomson’s model was not consistent with the results of later experiments. It failed to explain the observations of Rutherford’s α-particle scattering experiment.

J.J. Thomson proposed his atom model in 1898. 1. Explain Thomson’s model of atom. 2. Why Thomson’s atom model is called plum pudding model or watermelon model? 3. What is the limitation of Thomson’s atom model?

Answer»

1. J.J. Thomson proposed that an atom possess a spherical shape in which the positive charge is uniformly distributed. The electrons are embedded into it in such a manner as to give the most stable electrostatic arrangement. The mass of the atom is assumed to be uniformly distributed over the atom. This model explained the overall neutrality of the atom.

2. Thomson’s model of atom can be visualised as a pudding or watermelon of positive charge with electrons embedded into it like the plums or seeds.

3. Thomson’s model was not consistent with the results of later experiments. It failed to explain the observations of Rutherford’s α-particle scattering experiment.

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