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- A radioactive element that is one of the heaviest gases known. Its atomic number is 86. It is a daughter of radium.
Source: U.S. Nuclear Regulatory Commission
- A colorless naturally occurring, radioactive, inert gas formed by radioactive decay of radium atoms in soil or rocks.
Source: Terms of the Environment
- A radioactive gas that is released by uranium, a substance found in soil and rock. Breathing in too much radon can damage lung cells and lead to lung cancer.