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All atoms are small, hard and indivisible particles made out of a single material.
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Believed that the atom was divisible.
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All matter was made of atoms.
All atoms of the same element were identical. -
Inside the atom existed even smaller particles, the electrons.
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Confirmed that electron has a negative charge and the mass.
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Discovered the atom had a nucleus with protons.
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Discovered each element has a positively charge in the nuclei.
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Discovered electrons traveled in orbits.
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Discovered the neutron in the atom.