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1. Oxford American Dictionary

   noble gas

   • IPA[ˌnōb(ə)l ˈɡas]

   美式

   • n.
     any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known.

   • noun: noble gas, plural noun: noble gases

2. • 更多解釋

   noble gas

   • IPA[ˌnəʊbl ˈɡas]

   英式

   • n.
     any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 ...

   Oxford Dictionary