Radon is a naturally occurring, colorless, odorless, tasteless radioactive gas. Radon can build up in closed spaces like mines or buildings, and both radon and its decay products can be serious health hazards to people living and working where it has accumulated. Radon-224 undergoes alpha decay. What daughter nucleus is produced?

Uranium-238 undergoes alpha decay. Into what element does Uranium 238 transmute? What is the atomic number of the new element?

Technetium-99m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally 100 mg, how much would remain after 24 hours?

How long would it take a 1-kg radioactive substance with a half-life of 100 years to decay into 12.5 g?