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Chemistry, 20.10.2019 09:30 PayeA6901

Acertain radioactive element has a half-life of one hour. if you start with 40.0 grams of the element at noon, how much of the radioactive element will be left at 2 p. m.? (3 points)
0.0 grams
10.0 grams
20.0 grams
5.0 grams

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