Compare all the proposed models of an atom given in this chapter
Answer
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JJ Thomson’s Plum Pudding Model |
Rutherford’s Model |
Bohr’s Model |
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Explanation of the model |
As per Thomson, the Model of Atom is similar to a Christmas pudding. 1. Spherical pudding with dry fruits embedded in it. 2. Similarly atom is made up of positive charge with electrons embedded in it. |
Rutherford's model of an atom stated that: 1. Electrons revolve in circular paths around positively charged centre called nucleus; constitutes nearly all the mass of an atom. 2. The size of the nucleus is very small in comparison with the atom. |
Bohr’s model stated that: 1. Electrons move around Nucleus of an atom in discrete orbits. called energy levels or shells. 2. Electrons keep on revolving in the same shell without radiating energy. |
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Limitations |
Model could explain the neutral nature of an atom, but not the results of the experiments like Rutherford’s alpha particle scattering experiment |
When a charged particle like an electron moves in a circular path, it would accelerate and lose energy and ultimately fall into the nucleus, thus making it unstable. But, it doesn't really happen and Rutherford couldn’t explain. |
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Representation of the model |
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