Dylan S.

asked • 06/12/19

A sample contains 16 g of a radioactive isotope. How much radioactive isotope remains in the sample after 1 half-life?


A. 4 g

B.16 g

C.2 g 

D.8 g


1 Expert Answer

By:

Jesse E. answered • 06/12/19

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Masters in Chemistry specializing in preparing for ACT Science.

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After one half-life, one half of the radioactive isotope will remain. With an initial radioactive isotope sample weighing 16 grams, 8 grams of the radioactive isotope will remain after one half-life. The answer is D. After a second half-life, only 4 grams will remain. At the third half-life, 2 grams will remain.

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