radon
Heaviest noble gas
Radon is a radioactive gas that occurs naturally from the decay of uranium in soil and rock.
Colorless and odernless, it can accumulate in buildings and poses health risks with prolonged exposure—second only to smoking as a cause of lung cancer.
The home inspector tested for radon in the basement.
Inactive, physically or chemically
- argonUnreactive element eighteen
- kryptonInert gas, atomic thirty-six
- xenonElement fifty-four, noble gas
- neonInert illuminating element
helium · chemistry · atoms · protons · neutrons · electrons · isotopes · transmutation
Devoid of pigmentation
undetectable · imperceptible · diffusion · soluble · liquefied · fluorescent
Period for fifty-percent reduction
- emanationSomething that flows out
- disintegrationProcess of breaking apart
- progenyOne's biological descendants
Igneous rock, quartz-rich
- bedrockSolid stone underground
- groundwaterWater in underground rock
- fissuresNarrow splits in material
- karstEroded soluble rock terrain
limestone · shale · aquifer · phosphate · minerals · geochronology · sediment · subterranean
inert
Inactive, physically or chemically
- argonUnreactive element eighteen
- kryptonInert gas, atomic thirty-six
- xenonElement fifty-four, noble gas
neon · helium · chemistry · atoms · protons · neutrons · electrons · isotopes · transmutation · nonmetal
colorless
Devoid of pigmentation
invisible · undetectable · imperceptible · diffusion · soluble · liquefied · fluorescent
half-life
Period for fifty-percent reduction
- emanationSomething that flows out
- disintegrationProcess of breaking apart
- progenyOne's biological descendants
granite
Igneous rock, quartz-rich
- bedrockSolid stone underground
- groundwaterWater in underground rock
- fissuresNarrow splits in material
karst · limestone · shale · aquifer · phosphate · minerals · geochronology · sediment · subterranean · cave
- Air Pollutantssmoke, smog, soot, exhaust, fumes
- Mining Hazardscave-in, collapse, explosion, methane, gas explosion
- pollutantspollutants, pollutant, contaminant, contaminants, toxin
- Radioactive Elementsuranium, plutonium, thorium, polonium, francium
- gasesgas, air, oxygen, helium, nitrogen
- periodic tableperiodic table, elements, hydrogen, helium, carbon
radonfluorine
Pale yellow halogen gas
chlorine · oxygen · halogens · alkali metals
- radio stationFacility transmitting audio programming
- radio jingleBrief broadcast promotional tune
- car radioIn-dash audio receiver
- radio silenceAbsence of broadcast communication
- radiant heatingSurface-emitted thermal energy
- radio announcersBroadcast voice professionals
radio, radiant, radiate, radiation, radiator, radius, radium, radioactive, irradiate