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9 months ago
Thomson proposed that atoms are mostly made out of + charged material and there are - charged particles spread evenly throughout.
Rutherford discovered protons and the nucleus. He proposed that atoms have + particles in the center and that theres mostly empty space around it.
Bohr basically improved on Rutherford's model by proposing that electrons have fixed orbits and that electrons move around the nucleus in specific layers.
Chadwick discovered the neutron which was an atom with no charge and discovered that they're also in the nucleus.
Dalton created the first model theory and viewed the atom as tiny, solid balls that were invisible.
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