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Developing the Modern Atomic Model Our understanding of the atom has changed drastically over time. Most significantly, empirical evidence from the past two centuries has helped to develop our latest model of the atom – the quantum mechanical model. Fill out the graphic organizer below using your textbook and internet resources to summarize how past atomic theories have evolved into modern atomic theories. Early Greek Understandings (400 B.C.) Aristotle – 4 elements Democritus - All matter is made up of atoms and void (empty space) Atoms are indivisible Limitations: - Based on pure reason, not empirical evidence (experimentation) - There are 100+ elements (not 4) - Atoms are divisible Flash forward 2000 years… Scientist: John Dalton Diagram: Name of Model: Date: Empirical Evidence: Limitations: Theoretical Explanation: Scientist: J. J. Thomson Diagram: Name of Model: Date: Empirical Evidence: Theoretical Explanation: Limitations: Scientist: Ernest Rutherford Diagram: Name of Model: Date: Empirical Evidence: Limitations: Theoretical Explanation: Scientist: Niels Bohr Diagram: Name of Model: Date: Empirical Evidence: Theoretical Explanation: Limitations: Check Your Understanding: 1. What evidence invalidated Dalton’s atomic model? 2. If Thomson’s model of the atom had been valid, what would Rutherford have observed in the gold foil experiment? 3. Rutherford’s observations could not account for all the mass in the nucleus. Describe the discovery (and scientist) that provided an explanation. 4. A ladder and a ramp are one analogy for quantized vs. continuous energy. Explain. OR create your own analogy and explain. Scientist: Various Diagram: Name of Model: Quantum Atomic Model Date: Empirical Evidence: Theoretical Explanation: Limitations: List names of scientists involved in the Quantum Atomic Model and briefly list their contribution: Scientist Year Contribution