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This unit explores that historical development of the modern atomic theory through the study of matter and the analysis of several classic experiments. It begins by asking the question "What is matter?". Students will collectively develop a definition though discussions and debates of several ancient philosophical theories by individuals like Plato, Anaxinander, Aristotle, etc. By first developing an independent picture of matter students will be able to recognize any flaws in their definition as new facts, concepts, and/or laws regarding matter are presented. To monitor the progress at constructing a well-formulated definition students will keep a journal. Once a working definition of matter is developed, the unit will proceed with of the study of classic experiments by scientist like Dalton, Faraday, Thomson, Millikan, and Rutherford. As major theme throughout the unit is rediscovering of matter students become the scientists and, presented with experimental data, must interpret and make conclusions. This method will allow students to seek a clear understanding of why and how the established conclusions were made.
With the review of classic experiments completed, students will establish connections between their findings through debate and discussion, and formulate a hypothetical atomic theory. Students can than review the actual atomic theory as it exist today and compare and contrast this theory with their hypothetical theory.
(Recommended for Chemistry, grades 9-12.)