English > inert gas: 1 sense > noun 1, substance| Meaning | Any of the chemically inert gaseous elements of the helium group in the periodic table. |
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| Synonyms | noble gas, argonon |
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| Narrower | argon, Ar, atomic number 18 | A colorless and odorless inert gas |
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| helium, He, atomic number 2 | A very light colorless element that is one of the six inert gasses |
| krypton, Kr, atomic number 36 | A colorless element that is one of the six inert gasses |
| neon, Ne, atomic number 10 | A colorless odorless gaseous element that give a red glow in a vacuum tube |
| radon, Rn, atomic number 86 | A radioactive gaseous element formed by the disintegration of radium |
| xenon, Xe, atomic number 54 | A colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts |
| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
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| gas | A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely |
| Spanish | argonon, gas inerte, gas noble, gas raro |
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| Catalan | argonon, gas inert, gas noble, gas rar |
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