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Proposed that matter was composed of iny indivisible particles called atomos.
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Proposed "billiard Ball' model- atom is a unifrom soild sphere.
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Proposed "Plum Pudding" model- atom has a postive sphere (pudding) with negative electrons (plums) dispersed throughtout.
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Discovered nucleus of atoms. Proposed 'Nuclear' model- atom has dense, postive nucleus surrounded by negative electrons.
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Propsed "planetary' nodel- atom has electrons that move in circular orbits within specific energy levels.
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Revised 'Nuclear' model- atom has a neutral particles in the nucleus (neutrons).
