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This experiment is best used by student working in pairs.Grade Level: 5-12 grade Disciplinary Core Ideas (DCI) 3-5ETS1-2, MS-ESS1-4, HS-ESS1-6 Time for Teacher Preparation 40-60 minutes – To gather materials Activity Time: 40-60 minutes (1 Class Period) Materials: Objectives Students try to model radioactive decay by using the scientific thought process of creating a hypothesis, then testing it through inference.Seeing this connection will help students to understand how scientists can determine the age of a sample by looking at the amount of radioactive material in the sample.If two nuclei have different masses, but the same atomic number, those nuclei are considered to be isotopes.Carbon-14 is radioactive and undergoes radioactive decay.Radioactive materials contain some nuclei that are stable and other nuclei that are unstable.The amount of carbon-14 in the atmosphere has not changed in thousands of years.Even though it decays into nitrogen, new carbon-14 is always being formed when cosmic rays hit atoms high in the atmosphere.

Carbon-14 has 2 more neutrons than carbon-12 and 1 more than carbon-13, both of which are stable.By extension, this experiment is a useful analogy to radioactive decay and carbon dating.Students use M&M’s (or pennies and puzzle pieces) to demonstrate the idea of radioactive decay.Students should begin to see the pattern that each time they “take a half-life,” about half of the surrogate radioactive material becomes stable.Students then should be able to see the connection between the M&M’s and Puzzle Pieces and radioactive elements in archaeological samples.

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