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Suppose a laboratory has a 31 g sample of polonium -210. The half -life of polonium -210 is about 138 days. How many half -lives

Suppose a laboratory has a 31 g sample of polonium -210. The half -life of polonium -210 is about 138 days. How many half -lives of polonium -210 occur in 966 days? How much polonium is in the sample 966 days later?

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