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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.

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