| 单词 | noble gas |
| 释义 | noble gas (once / 562825 pages) n WORD FAMILY noble gas: noble gases USAGE EXAMPLESWhen noble gases are excited, they give off a flash of light that we can watch for. Nature(Sep 27, 2016) As a noble gas, it’s almost totally inactive. BusinessWeek(Sep 25, 2014) Noble gases like helium, neon, and argon “stick” to natural gas and move with it, unchanged, as it passes through different layers of earth. Newsweek(Sep 15, 2014) n any of the chemically inert gaseous elements of the helium group in the periodic table Syn|Hypo|Hyper argonon, inert gas Ar, argon, atomic number 18 a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere He, atomic number 2, heliuma very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) Kr, atomic number 36, kryptona colorless element that is one of the six inert gasses; occurs in trace amounts in air Ne, atomic number 10, neona colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts Rn, atomic number 86, radona radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health Xe, atomic number 54, xenona colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts 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 gasa fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely |
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