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Democritus The Development of the Atomic Theory Dalton Thomson (460 BC – 370 BC) (1766 – 1844) (1856 – 1940) What was his theory of atoms? Diagram: What was the name of the theory he proposed? What was the name of Thomson’s Model? What was his theory of atoms? What was his contribution to the theory of an atom? Diagram: Diagram: Rutherford Bohr Schrodinger Chadwick (1871 – 1937) (1885 – 1962) (1887 – 1961) (1891 – 1974) What were three conclusions from his experiment? Explain his contribution to the theory of the atom. Explain the results of the “Gold Foil Experiment” Diagram: DIagram: What was his discovery about an atom’s electrons? What was his contribution to the theory of the atom? What is an electron cloud? What type of charge does a neutron have? Diagram: Diagram: