ADJ.
high, noble
VERB + RADON
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PREP.
in
noun
The chemical element (symbol Rn, formerly Ro) with atomic number 86. It is an odorless, colorless, chemically inert but radioactive noble gas.
Radon-222 (22286Rn), the most stable isotope of said element.
name
A surname from German.
noun — a radioactive gaseous element formed by the disintegration o
Helium, neon, argon, krypton, xenon and radon are noble gases.
Several measurements show high radon levels in this area.
How much radon is there?