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Proposed a mechanical universe with small solid masses in motion.
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Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.
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Proposed electric and magnetic fields filled the void.
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Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram. Studied "canal rays" and found they were associated with the proton H + .
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Using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm) gold foil. He established that the nucleus was: very dense, very small and positively charged. He also assumed that the electrons were located outside the nucleus. Also studied radiations emitted from uranium and thorium and named them alpha and beta. 1898 - 1911
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Published the famous equation E=mc 2 or The Theory of Relativity
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Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of successive orbital shells of electrons.
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Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminacy - you cannot know both the position and velocity of a particle.
