Radioactive radon-222 gas 222rn occurs naturally as a
Radioactive Radon-222 gas (222Rn) occurs naturally as a product of uranium decay. The half-life of222Rn is 3.8 days. Suppose a flask originally contained1.0×1013atoms of222Rn. How many atoms of222Rn will remain after one month (30. days)?
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