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Chemistry, 10.12.2020 07:00 delayne22

A radioisotope has a half-life of 12 hours. How much of an original 250 nanograms sample will remain after 72 hours? (A) 2.6 nanograms
(B) 3.9 nanograms
(C) 5.7 nanograms
(D) 8.2 nanograms

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