Helium, neon, argon, krypton, xenon and radon are noble gases.
Source: tatoeba (1555652)
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Helium, neon, argon, krypton, xenon and radon are noble gases.
Source: tatoeba (1555652)
Several measurements show high radon levels in this area.
Source: tatoeba (8016515)
How much radon is there?
Source: tatoeba (10852546)
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.