搜尋結果
noble gas
- IPA[ˌnōb(ə)l ˈɡas]
美式
- 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