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Aristotle says his theory of the atom to change everything.
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1)All Atoms of any one element are exactly alike in all aspects; in particular, same weight.
2)Atoms of different elements have different properties; in particular, different weight.
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 -
John Newlands publishes his incorrect 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 using Crooke's tubes.
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Mendeleev creates the first correct periodic table
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Rutherford discovers the nucleus during an experiment.
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Bohr discovers the proton.
