The half life of isotope #earthsciencerocks is 5 years. after 10 years, how much of the parent material remains? a. 0% b. 100% c. 75% d. 25%

After 10 years, the isotope would have had two half lives. For each half life, half of the material reacts. Therefore, after one half life, 50% remains. Then, after a second, 25% remains. D is the correct answer.

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