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This two-hour multimedia lesson explores models for understanding the basic pattern of the arrangement of electrons on energy levels around an atom. Focusing on the first 20 elements, the lesson opens with an animated model of energy levels in an oxygen atom. Next, download and print "Element Game Cards", a cooperative activity where learners place a card with its correct atom and practice with Lewis dot diagrams. The second day begins with guided instruction to find patterns in rows/columns of the first 20 elements. It concludes with four videos of different chemical reactions in which learners relate the reactions to location of elements on the periodic table.
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