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A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The half-life of for the decay of uranium-238 to lead-206 is 4.5 × 109 yr. The rock was formed __________ yr ago.

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Nuclear chemistry is a branch of chemistry that studies radioactivity, nuclear processes, and changes in the nuclei of atoms.


A rock contains 0.313 mg of lead-206 for each milligram of uranium-238. The half-life of for the decay of uranium-238 to lead-206 is 4.5 × 10<sup>9</sup> yr. The rock was formed __________ yr ago.






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