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Chemistry, 03.10.2019 10:30 Symonek

Acertain radioactive element has a half-life of one hour. if you start with 20.0 grams of the element at noon, how much of the radioactive element will be left at 3 p. m.?
a. 10.0 grams b. 5.0 grams c. 2.5 grams d. 1.25 grams

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