noble gas - WordReference.com Dictionary of English

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noble gas

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Concise Oxford English Dictionary © 2008 Oxford University Press:
noble gas

▶noun Chemistry any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, which form compounds with difficulty or not at all.

'noble gas' also found in these Oxford entries:

argon - helium - inert gas - krypton - neon - radon - rare gas - xenon

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