Answer:
Radon is
the chemical element of atomic number 86, a rare radioactive gas belonging to the noble gas series
Radioactivity is the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
An environmental hazard is a type of hazard resulting from chemical, biological, or physical agents either from ongoing or previous human activity, or the hazard may be a property present in the natural environment. This type of hazard poses a risk to either human health or to the natural environment.
Wavelength is the distance between successive crests of a wave.
Degradation is the wearing down of rock by disintegration.
Radiation is the emission of energy as electromagnetic waves or as sub-atomic particles.
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