Radon gas, 222/86Rn, is considered a serious health hazard (see discussion in text). It decays by -emission.

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Radon gas, 222/86Rn, is considered a serious health hazard (see discussion in text). It decays by α-emission.
(a) What is the daughter nucleus?
(b) Is the daughter nucleus stable or radioactive? If the latter, how does it decay, and what is its half-life?
(c) Is the daughter nucleus also a noble gas, or is it chemically reacting?
(d) Suppose 1.0ng of 222/86Rn seeps into a basement. What will be its activity? If the basement is then sealed, what will be the activity 1 month later?
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