Question #a7d58
1 Answer
Radon
Explanation:
Radium is a decay product of Uranium. As Radium is still highly radioactive it further decays into Radon.
This is what the decay chain of uranium-238 looks like
![http://www.physics-experiments.com/]()
Notice that about half way down the chain, radium-226 decays into radon-222 via Alpha decay.
![http://glencoe.mheducation.com/sites/007874637x/student_view0/chapter10/section2/self_check_quizzes.html]()