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-Showed that common substances always broke down into the same elements in the same proportions
- Concluded that the various compounds were combinations of atoms of different elements, each of a particular size and mass that could neither be created nor destroyed.

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-He showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons.

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- While studying the effects of x-rays on gases, he decided to look at atoms more closely
- He shot small, positively charged alpha particles at a sheet of gold foil.

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- Claimed that electrons orbit the nucleus at fixed energies and distances,, able to jump to one level to another but not exist in the space between.

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- He showed that it was impossible to determine the exact position and speed of electrons as they moved around the atom