单词	noble gas
释义	noble gas noun : any of a group of rare gases that include helium, neon, argon, krypton, xenon, and usually radon and that exhibit great stability and extremely low reaction rates called also inert gas Example Sentences Recent Examples on the Web Xenon is a colorless and odorless noble gas that is found in tiny amounts throughout our atmosphere. Joshua Hawkins, BGR, 7 July 2022 However, work by other research teams in 2015 ruled out a comet or meteorite as the stone's source, based on noble gas and nuclear probe analyses. Jennifer Ouellette, Ars Technica, 2 June 2022 Just as a full electron shell makes a chemically inert noble gas, a full shell of protons or neutrons offers extra stability and longer lifetimes. Daniel Clery, Science | AAAS, 12 Feb. 2021 The noble gas is difficult to obtain in large quantities owing to the energy-intensive process needed to extract it from the air and because of competing demand from electronics, lighting and space industries. Elizabeth Gibney, Scientific American, 8 Oct. 2020 But, around the turn of the twentieth century, after the other noble gases had been discovered and shown to share properties with helium, other scientists made a column just for them, and Mendeleev fell in line. Neima Jahromi, The New Yorker, 27 Dec. 2019 Related Stories Beryllium, a brittle metal with atomic number 4, and helium, a noble gas with atomic number 2, are similar in ways that could influence the observation of the X17 particle anomaly in both elements. Caroline Delbert, Popular Mechanics, 20 Nov. 2019 Radon is a noble gas that is a natural byproduct of the constant breakdown of uranium. Boston.com Real Estate, 12 Nov. 2019 Scientists are hunting through macrofossils, leaf wax, mineral types, noble gases, and much more to answer questions about what Greenland’s ancient landscape looked like when it was last exposed. Paul Voosen, Science | AAAS, 29 Oct. 2019 See More Word History First Known Use 1902, in the meaning defined above Medical Definition noble gas noun no·​ble gas ˈnō-bəl-  : any of a group of rare gases that include helium, neon, argon, krypton, xenon, and sometimes radon and that exhibit great stability and extremely low reaction rates called also inert gas
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