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John Dalton Discovered that compounds are made of certain atoms with a specific mass and specific property -
JJ Thomson discovered the electron and proposed a new model for the atom -
Ernest Rutherford, with shooting alfa particles at gold foil discovered that atoms are mostly empty space, the nucleus is positively charged, and very dense -
Niels expanded on the electron and proposed that it orbits the nucleus at certain speeds and distances -
James discovered the neutron and how it shares space in the nucleus with the proton but unlike the positively charged proton the neutron is neutrally charged
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