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Atomic Theory and the Evolution of Atomic Structure Democritus and his “atomos” (460-370 B.C.) What is atomos? What is the atomos concept? What did Democritus hypothesize? John Dalton’s Atomic Theory (early 1800s) – Five Hypotheses 1. 2. 3. 4. 5. J.J. Thompson’s Cathode Tube Experiment (1897) What did he do? What indirect evidence did he see? What did he discover as a result? What was his model of the atom called? Picture? Atomic Theory and the Evolution of Atomic Structure Rutherford’s Gold Foil Experiment (1911) What did he do? What indirect evidence did he see? What did he discover as a result? What was his model of the atom called? Picture? Neils Bohr - Planetary or Bohr Model of Atom (1913) How is Bohr’s model similar to Rutherford’s model? What did he conclude about electrons and energy? What two hypotheses of Dalton’s Theory have been proven incorrect? Explain. Old Statement: 1. Corrected Statement: Old Statement: 1. Corrected Statement: