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Students should recognize each time the number should go down by appx half.Then students take the class data and create a graph comparing the number of parent isotopes to the number of half-lives.They then gather the radioactive, or M side up M&Ms, put them back in the container, and then pour them out again. and continue this process until all M&Ms are stable, or M side down.During each trial, students record the number of radioactive parent isotopes and record this in a data table.For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half-life in the early 1950s.Rutherford applied the principle of a radioactive element's half-life to studies of age determination of rocks by measuring the decay period of radium to lead-206.

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The term is also used more generally to characterize any type of exponential or non-exponential decay.

Once this is done, students have some post questions they are given that they should record in their science notebook.

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