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Uranium-235 (u-235) radioactively decays into lead-207 (pb-207). i'm measuring the number of atoms in a mineral, and i find that there are 500 atoms of u-235 and 1500 atoms of pb-207. if we assume the mineral contained only parent and no daughter, then how many atoms of these elements were in the mineral when the rock first formed?
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Uranium-235 (u-235) radioactively decays into lead-207 (pb-207). i'm measuring the number of atoms i...
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