Radon

Radioactive noble gas formed from natural decay.

Radon (symbol Rn, atomic number 86) is a radioactive noble gas. It is produced from the natural decay of uranium and thorium found in rocks, soil, and water. Radon poses a health hazard due to its radioactivity and potential for inhalation, which can increase the risk of lung cancer.

/ˈreɪdɒn/

Radon is named after the element radium, from which it was first discovered.

Radon is a gas you can't see or smell that comes from rocks and soil, and it can be harmful if it builds up in your home.

noble gas radioactive element

chemical element noble gas radioactive