LEARNit Dictionary
noble gas
noun
/ˌnəʊbl ˈɡæs/
UK
/ˌnəʊbl ˈɡæs/
US
1
any of a group of gases that do not react with other chemicals. Argon, helium, krypton and neon are noble gases.
گاز نجیب, گاز خنثی