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First of all he did'nt say that it was invisible, he said it was indivisible i.e. it cannot be divided further but it can be in the form of protons,electrons and neutrons.That's why it was not accepted. By the way he proposed atomic theory not a model. Models were proposed by THOMSON, RUTHERFORD and NEIL BOHR.

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13y ago
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Q: Why john Dalton's atomic model which describes an atom as an invisible spherical participle are no longer accepted?
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