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Democritus discovered atoms. It was a guess and couldn't be tested because of limited amount of technology
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Dalton developed his theory of atoms and matter. Daltons experiments and measurements allowed him to support his hypothesis with evidence.
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JJ Thomson discovered the electron using Experiment using electric charges in cathode ray tubes.
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Rutherford developed the planetary model of the atom.
Experiment using alpha particles fired at thin gold foil and -
Bohr developed a model of the atom.
Bohr used mathematical models and laws -
The neutron was discovered by James Chadwick.
Experiments using kinematics and accurate measurements lead to proving the existence of a previously undetected subatomic particle, the neutron.
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