Radon has been the focus of much attention recently because it is often found in homes. Radon-222

Question:

Radon has been the focus of much attention recently because it is often found in homes. Radon-222 emits α particles and has a half-life of 3.82 days.
(a) Write a balanced equation to show this process.
(b) How long does it take for a sample of ²²²Rn to decrease to 20.0% of its original activity?

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