noble gas

Từ điển Oxford Learners Wordfinder Dictionary

noun

any of the chemically inert gaseous elements of the helium group in the periodic table
• Syn:
inert gas, argonon
• Hypernyms:
chemical element, element, gas
• Hyponyms:
argon, Ar, atomic number 18, helium, He,
atomic number 2, krypton, Kr, atomic number 36, neon, Ne,
Ne, radon, Rn, atomic number 86, xenon,
Xe, atomic number 54