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Thomson's Model of an Atom Video Lecture - Class 9

FAQs on Thomson's Model of an Atom Video Lecture - Class 9

1. What is Thomson's model of an atom?

Ans. Thomson's model of an atom, also known as the plum pudding model, suggests that an atom is composed of a positively charged sphere with negatively charged electrons embedded in it. According to this model, the electrons are scattered uniformly throughout the positively charged sphere.

2. Who proposed Thomson's model of an atom?

Ans. J.J. Thomson, an English physicist, proposed the plum pudding model of an atom in 1904. He conducted experiments on cathode rays and discovered the existence of electrons, which led to the development of this model.

3. How does Thomson's model explain the structure of an atom?

Ans. Thomson's model explains that an atom consists of a positively charged sphere, which represents the overall positive charge of the atom. The negatively charged electrons are embedded in this sphere, somewhat like plums in a pudding. This model suggests that the positive and negative charges are evenly distributed throughout the atom.

4. What are the limitations of Thomson's model of an atom?

Ans. Despite its significance at the time, Thomson's model had certain limitations. It failed to explain the stability of atoms and the distribution of electrons within the atom. Additionally, the model did not account for the existence of a nucleus or the presence of subatomic particles such as protons and neutrons.

5. How did Thomson's model contribute to our understanding of atomic structure?

Ans. Thomson's model played a crucial role in advancing our understanding of atomic structure. It provided evidence for the existence of subatomic particles (electrons) within atoms and highlighted the presence of positive and negative charges. Although this model was later replaced by Rutherford's nuclear model, it laid the foundation for further discoveries and theories in the field of atomic physics.

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Oct 06, 2025 Last updated

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