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**Unformatted text preview: **d. electron capture e. gamma 4. Radon-222 undergoes alpha emission with a half-life of 3.823 days. If 50.0 grams of radon gas were in a closed basement, how many grams would be left after 19.00 hours? a. 43.3g b. 1.60g c. 31.0g d. 40.7g e. 18.1g 5. Carbon-14 has a half-life of 5730 years. How old is a bone that has 77.2% of its carbon-14 remaining? a. 4420y b. 2140y c. 3.60 x 10 4 y d. 1.209y e. 21.39y...

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