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Scientists use radioactive decay to determine the age of the rock. Radioactivity Radioactivity - the spontaneous decay of certain unstable atomic nuclei. 1 half life 15 hours 220 grams 2 half lives 30 hours 110 grams 3 half lives 45 hours 55 grams 4 half lives 60 hours.5 grams 25, practice Problems. 1 half life 45 days 600 grams 2 half lives 90 days 300 grams 3 half lives 135 days 150 grams 4 half lives 180 days 75 grams. When the organism dies, the "clock" starts as the carbon-14 decays, changing the ratio 20, radioactive Decay Radioactive isotopes decay until they are stable. Atom Review What are the subatomic particles of an atom?





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