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For instance, in fossil one, the students will take 15 divided by 60 and come up with the percentage .25.Next, they will look at the graph of decay and see that when 25% of the parent isotope atoms are left, the isotope has gone through two half-lives.
The atom's nucleus is composed of protons and neutrons, which are much more massive than electrons.
Determining the Age of Rocks and Fossils, University of California, Berkeley.
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