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Dalton discovered that elements are made up of super small particles called atoms. He used the atomic theory.
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Thomson had a theory and discovered the electron using Crookes, or a cathrode ray tube.
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Rutherford had a theory of radioactivity and discovered that electrons orbited around the nucleus.
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Bohr had a theory and discovered that there were energy transfer procceses using the quantom theory.
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They had a theory and discovered that each element was made up of unique atoms. They used mathmatical models.
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Democratis had the theory of an atom and discoverd that atoms are industructable.
