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400
democritus model created
Purposed that the element was made of tiny,solid particles that could not be subdivided. -
Dalton model created
Said the atom was a round ball with protons and electron embedded evenly throughout. -
electrons discotverd
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Thompson model created
Purposed that all atoms contained negative carge particles. Thought the negative particles were evenly embedded througout the a costivly charged sphere. -
Rutherfords model created
Purposed that all the mass of an atom was concentrated in one cental atomic nucleus sorrounded by electrons. -
bor model created
Purposed that electrons follow a fixed orbit around the nucleus. -
electron cloud model created
This the current accepted model of the of atomic structure. The electrons do not follow a fixed orbit but tend to occur more frequently in certain areas. -
protons discovered
relized that there must be positive aroms in a element to balence out the electrons -
neutrons discovered
Not being dicovered until 1932 there was a slimm chance of finding that the neutrons.
