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Lab 7: Radioactivity
•    On your own and without assistance, complete this Lab 7 Answer Form and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).
•    To conduct your laboratory exercises, use the Laboratory Manual that is available in the classroom. Laboratory exercises on your CD may not be updated.
•    Save your Lab 7 Answer Form in the following format:  LastName_Lab7 (e.g., Smith_Lab7).
•    Submit your document in a Word (.doc or .docx) or Rich Text Format (.rtf) for best compatibility.

Experiment 1: Estimating Half-Life

Table 2: Half-Life Experimental Results
Total number of atoms:
Trial     Number of decayed atoms     Average     Percentage of decayed     atoms                                   (from original number)
1st Round    2nd Round    3rd Round

1.    What is meant by the term half-life?

2.    At the end of two half-lives, what percentage of atoms (Skittles™) have not decayed? Show your calculation.

3.    Using your data, graph the number of undecayed atoms vs. trials below to show when 1/2, 1/4, 1/8, and 1/16 of your Skittles remain (use the values next to the boxes you put checks next to in Step 8 of the procedure).

4.    How would the graph change if 20 Skittles were used in this experiment?

5.    If 1/8 of a radioactive element remains after 600 years, what is that element’s half-life?

Learning Summary
1.    Please include a brief one Paragraph Learning Summary that described what you thought the main take-aways were for the lab and what you think that you learned by doing this experiment.

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