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Niels Bohr finds that electrons travel in separate orbit bits around the nucleusHenry Mosley used experiments to determine the atomic number of an elementDe Brogile suggests that all matter has wave propertiesRobert Millikan performs the oil drop experiment which discovers the charge of the electrons as negativeProust discovers that a pure substance will always contain the same elementsJohn Dalton proposes the first atomic theory
1. All matter is made up of tiny invisible particles
2. Atoms of the same element are the same
3. Atoms of different elements are different
4. Atoms combine to form coumpundsJJ Thompson discovers the electron and the first subtomic particleErnest Rutherford finds that the atom is mostly empty with a very tiny positive nucleus coreJames Chadwick discovers the neutron
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