HEAVIEST INERT GAS Crossword Clue
HEAVIEST INERT GAS Crossword Clue
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Crossword Puzzle Infos
The heaviest inert gas is RADON, which is a chemical element with the symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas that occurs naturally in minute quantities in the atmosphere. RADON is one of the densest substances that can exist as a gas at standard temperature and pressure. It is also the only gas under normal conditions that has no stable isotopes.