![]() I also wanted a focus on how to explain the trends using Coulomb’s Law on AP free response questions. So, POGIL® already has an activity for periodic trends and Coulomb’s Law, but I specifically wanted something to get them using the Bohr model cards. ![]() Creating the Model Exploration Activity (fake POGIL®) Plot decay chains (e.g., using the radon chain on the Decay Chain Worksheet or others that students create) on a graph with the atomic numbers identified on one axis (x or y) and the atomic mass on the other (x or y).With the cards made, next I needed some structure for my students to follow in order to make the connections I wanted them to make.The diagram can be completed on paper or electronically. The diagram can be simple (e.g., use elements with shorter chains or use a portion of longer decay chains) or complex, based on the time available. Diagram a decay chain for a particular radioactive element.Optional activities or extensions: Have students:.For example, americium-241 is used in nuclear gauges, plutonium-238 is an alpha-emitting isotope that is used for generation of electric power in space probes. Alpha-emitting elements with longer half-lives are used for industrial purposes. For example, cesium-137 is used in medical therapy to treat cancer and in moisture-density gauges, leveling gauges and thickness gauges. Beta-emitting elements with short half-lives are used in nuclear medicine, imaging and gauges. We use radioactive elements for many different purposes. How we might use and benefit from radioactive elements that decay.What they have learned from the activity.Have students share (orally or in writing):.The Decay Chain: Teacher Answer Key provides questions and answers to review with students. Have students examine each decay chain, identify the elements (or isotopes) within each decay chain, and determine whether each transformation is due to the emission of an alpha or beta particle. Distribute the Decay Chain Worksheet and the Periodic Table of Elements.Review the examples and work through the questions listed on the Decay Chain Examples: Teacher Answer Key with students.Display or provide students with a copy of the Decay Chain Examples.Radioactive decay occurs when an unstable (radioactive) atom gives off energy (in the form of ionizing radiation) as it attempts to become a stable atom and is no longer radioactive. Ask students to hypothesize how radioactive atoms or materials decay.Prompt students to hypothesize whether things decay at the same rate and in the same way. Students should address how the items change in composition over time. Ask students what happens when things (e.g., plants, food and wood) decay.Start with a vocabulary activity if students are not familiar with radiation and the terms used in this activity, or provide students with the terms and definitions.Student computers with Internet access to Radiation BasicsĤ5-60 minutes, not including optional activities or extensions.Periodic Table of Elements (to display or distribute to students).Decay Chain Worksheet (one per student, pair or group) and Decay Chain Teacher Answer Key.Decay Chain Examples (display or distribute to students) and Decay Chain Examples Teacher Answer Key.Computer and/or projector to display information.The Radioactive Atom: Teacher Background Information.Structure and Properties of MatterĮach italicized document title can be found at the bottom of this page, and is available for printing and distribution. The concepts in this activity can be used to support the following science standard: The information presented in Activity 2: Atomic Math and Shorthand may help introduce the concepts needed to complete this activity. NOTE: Students should be familiar with atomic structure and the concept of radioactivity prior to completing this activity. Identify types of radiation emitted with each step in the decay chain.Learn about radioactive decay and decay chains.Printable Worksheets and Classroom Aids.
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