Radon is a naturally occurring radioactive gas. It is on of the products produce as uranium decays. Radon has a half-life of approximately 4 days. If you have a sample of radon with a mass of 4 grams, how many grams will be left at the end of 8 days?
(A) 4
(B) 2
(C) 1
(D) none of these
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