Assertion: radon | /r/HasProperty | radioactive noble gas
Facets:
Source sentences:
text: Radon is a radioactive noble gas that is formed by the decay of radium.
text: 2 ) is a compound of radon, a radioactive noble gas.
text: Radon is a radioactive noble gas that comes from the decay of radium in the soil.
text: Radon is a radioactive noble gas that comes from the decay of radium in the soil.