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Discovers the atom.
Everything is made up of atoms! -
Changes the theory of an atom!
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1)All Atoms of any one element are exactly alike in all aspects; 2)Atoms of different elements have different properties 3)A compound, as distinguished from an element is composed of a certain definite integral number of atoms of each of the elements present. 4)In the chemical reactions that may occur, none of the atoms are destroyed and no new ones are created.5)When elements react, their atoms sometimes combine in more than one
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Publishes his version of the Periodic table
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Used cathode rays tubes and discovered cathode rays which indicated that different atoms were of the same material.
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Discovered the electron
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First correct periodic table!
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Discovers the proton!