15 Uranium-232 has a half-life of 68.9 years. A sample of uranium-232 has a mass of 6.0 x 10*g. a) When will the mass of uranium-232 be 1.5 x 10ʻg? b) Nuclear equation question: Fill in the missing numbers of protons and neutrons in the large nucleus in the alpha decay shown in the diagram. 84P 134 N Could this type of uranium be used to find the age of rocks that formed many millions of years ago? Explain your reasoning.

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