This student hand-out was created specifically to accompany the PhET simulation "Alpha Decay". Appropriate for grades 8-12, it provides guided directions to help students understand the random nature of decay of a radioactive substance (Polonium-211). As they watch the alpha particle eject from the nucleus, they can see the "parent" decay into an atom with a mass number of 4 less than the original. Reset the nucleus to see the randomness. Next, the ante is upped, as students switch the view to "
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