Radon

[Jason Yan]

The [radioactive] afterproduct of Radium-226 through [alpha] [decay].

[Becky]

A naturally occurring radioactive gas found in the United States in nearly all types of soil, rock, and water. It can migrate into most buildings. Studies have linked high concentrations of radon to lung cancer.

[Hina Muqadas]

The chemical element of atomic number 86, a rare radioactive gas belonging to the noble gas series.

[Tariq Zaki]

a chemical element that is a radioactive gas formed when radium decays and found naturally in rock and soil: