Investigations: Introduce Periodic Trends with the Atomic Radius Exploration activity in this lesson.Students use imaginary elements to create a periodic table based on the known properties of those elements. Make a Periodic Table Activity: Use this activity to get a quick assessment of your students’ understanding of the organization of the Periodic Table.Students will use the online periodic table,, to investigate a number of chemistry concepts and explore information about the elements, including historical data, physical properties, periodic trends and more. Investigations: Your students can learn the basics about the Periodic Table by completing the Periodic Table Scavenger Hunt and the The Organization of the Periodic Table activities.Dmitri Mendeleev: You may also want to show your students this video, which tells the story of Dmitri Mendeleev, who organized the periodic table, even leaving gaps to be filled in with elements that weren't yet discovered.History of the Periodic Table: This video tells the story of the development of the periodic table and pays tribute to each of the major scientific contributors who made great discoveries through their efforts to best organize the elements.Both of the videos have student activity sheets that include questions for them to answer as they watch. Use videos from the Founders of Chemistryvideo series to show your students how the Periodic Table was developed.The teacher can remove two cards from each student’s deck, and after they organize the cards the students can predict (draw) the missing aliens. Students organize alien cards into groups and periods following trends, similar to how the periodic table is put together. Aliens Activity: Introduce the unit by having your students complete this activity.Please note that most of these resources are AACT member benefits.The teacher notes, student handouts, and additional materials can be accessed on the page for each individual activity.The activities shown below are listed in the order that they should be completed.Refer to the safety instructions given for each individual activity.Refer to the materials list given with each individual activity.Lesson: 7–10 class periods, depending upon class level Materials Teacher Preparation: See individual resources This lesson supports students’ understanding of Understand that the current periodic table was developed over time based on many discoveries, models and revisions.Recognize the contributions to the organization of the periodic table over time by important scientists.Classify an element as a metal, nonmetal, or metalloid based on its physical and chemical properties. Identify unknown elements based on their properties of atomic radius, malleability, conductivity, and ionization energy.Understand and be able to predict the trends of atomic radius, ionic radius, and ionization energy.Recognize the pattern of the physical properties of the elements with relationship to period and column.
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