JAMB Chemistry 2023 Paper

Concept:Radon is the only naturally radioactive noble gas formed from the radioactive decay of uranium and thorium.Explanation:Radon ($\mathrm{Rn}$) is produced in the Earth’s crust as uranium ($\mathrm{U}$) and thorium ($\mathrm{Th}$) undergo radioactive decay.It belongs to Group 18 (noble gases) but is unstable and emits radiation.Unlike argon, krypton, and neon, radon is radioactive and can accumulate in enclosed spaces, posing a health risk.Answer:C. Radon