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He was the first one that started using symbols to represent atoms. He had many theories and one of them was that the atom was a solid sphere.
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He investigated the atom and that's how he discovered the electrons. He created the Plum Pudding Model
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Rutherford made experiments with gold foils that made him get a theory. He created the Nuclear Theory made the center of the atom the nucleus
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Bohr had theories about electrons. So he made rules of what electrons do.
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He used wave mechanics as a mathematical model of atoms. He made it into a model and that we use nowadays to check the orbitals.
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