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Democratus believed an atom was a small indivisible ball that made up all life.
c. 400 B.C.E. -
Dalton believed all atom's were indestructable and indivisible. He created the atomic theory.
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Thomas thought that an atom was essantially a proton soup mixed with individual electrons, like plums in plum pudding or cherries in cherry tarts.
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JJ Thomas's discovery of negitivly charged sub atomic particles spawned from a test he did with magnets and a cathode tube.
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Discovered the electric charge of an electron as well as it's mass
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The discovery of the nucleus was in this expiriment, supervised by Rutherford. The partiicles occassionally scattered, causing scientists to theorize that a tiny, dense object located inside an atom was the cause.
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Discovered the nucleus of an atom
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Discovered nucelus is densely covered in protons and surrounded by an electron cloud
