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John Dalton published "New System of CHemical Philosophy." It explained that each element was made of tiny solid balls called atoms.
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Thomson propeds a new model that showed the atom as a muffin with berries scattered throughout it.
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Hantar Nagaoka proposed that the atom consisted of a positively charged nucleus and negatively charged electrons orbiting it.
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Ernest Rutherford concluded that the atom is mostly empy space because the orbiting electrons are small.
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Niels Bohr proposed a model that the electrons were not randomly and in fact were in shells around the nucleus.
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The atomic model has come from the work of many scientists and is still being developed today.
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James Chadwick discovered the neutron, a particle with no charge in the atom.