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Geography, 28.09.2019 05:30 s6ties

Uranium-235 (u-235) radioactively decays into lead-207 (pb-207). if i'm measuring the number of atoms in a mineral, and i find that there are 1000 atoms of u-235 and 3000 atoms of pb-207, 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). if i'm measuring the number of atom...
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