A radioactive noble gas that occurs naturally from uranium decay and can accumulate in buildings, posing health risks.
Named after radium (from Latin radius 'ray') with suffix -on typical of noble gases. Discovered in 1900 by Friedrich Dorn, initially called 'radium emanation.'
Radon is the invisible home invader - this odorless gas seeps from the ground into basements worldwide, making it the second leading cause of lung cancer after smoking, yet most people have never heard of it.
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