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Substance that does not react chemically. noble gas ... (Of the six noble gases, only krypton, xenon, and radon have the ability to form stable compounds.
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The noble gases make a group of chemical elements with similar properties: under standard conditions, they are all odorless, colorless,monatomic gases with very low chemical reactivity. The six noble gases that occur naturally are helium (He)neon (Ne)argon (Ar)krypton (Kr)xenon (Xe), and the radioactive radon (Rn).
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