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The elements are classified based on similarities, differences, and trends in their properties. Recognizing periodic trends in the physical and chemical properties of the elements is key to understanding the full value of the periodic table. Which elements more easily undergo oxidation by giving up electrons? What factors determine the ease of reduction of elements or ions? How does the relative reactivity of a group of metals or nonmetals influence their uses in commerce, engineering or medicine? Investigate these questions to reinforce key learning objectives concerning oxidation and reduction.