![]() The activity begins with four blank periodic tables (Figure 1) that include boxes for the main-group elements in the first four periods, plus data tables (Figure 2) with the values for each trend. The supporting information includes black-line masters of all of the materials used by the students, and a teacher’s guide that include suggested guided questions and answers, differentiated by level.įigure 2: Sample of data table provided to students The Activity Finally, the groups share their results with the class and the class reflects on their learning. The groups extend and reinforce their conclusions through a series of thought-provoking questions. The students then work collaboratively in groups of three or four to analyze trends in each model and develop conclusions. The students begin the activity individually during class by developing predictions, then creating four models, one for each periodic trend. It is presented following introductory lessons about the history of the periodic table and the significance of periods and groups in terms of valence electrons and energy levels, but before any trends have been discussed. This activity is designed for high school or college general chemistry classes. There is a separate table for each of the four trends, with the headings changed as appropriate.
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