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Discovered the Atom
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Made Atomic Theory
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Made what people call the "Crookes tube"
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Made the Periodic table
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He was one of the first, if not quite the first, to propound the conception of periodicity among the chemical elements
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. He is credited for the discovery of the electron and of isotopes, and the invention of the mass spectrometer
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Made a diffrent view of an Atom.
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Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922.
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discovery of the neutron.
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Did not believe in Atoms, He developed the theroy that all matter consisted of four elements: Earth, Air, Water and Fire.