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
Examples of noble gas in a Sentence
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This noble gas, once used as anesthesia, is now rumored to increase red blood cell production and protect the brain at extreme altitudes.
—
Popular Science Team, Popular Science, 2 July 2025
Subsequent analysis indicated that the Three Mile Island accident released fewer than 13 million curies, most of it in the form of relatively harmless radioactive noble gases, as well as 13 to 17 curies of radioactive iodine.
—IEEE Spectrum, 28 Feb. 2014
First discovered in the 1880s, the noble gas was long used as an anesthetic.
—Sarah Kuta, Smithsonian Magazine, 28 May 2025
When a nucleus has a magic number of protons or neutrons, then the particular orbit is filled, and the nucleus is not very reactive, similar to the noble gases.
—Artemis Spyrou, Discover Magazine, 9 Oct. 2024
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Popular Science Team, Popular Science, 2 July 2025
Subsequent analysis indicated that the Three Mile Island accident released fewer than 13 million curies, most of it in the form of relatively harmless radioactive noble gases, as well as 13 to 17 curies of radioactive iodine.
—IEEE Spectrum, 28 Feb. 2014
First discovered in the 1880s, the noble gas was long used as an anesthetic.
—Sarah Kuta, Smithsonian Magazine, 28 May 2025
When a nucleus has a magic number of protons or neutrons, then the particular orbit is filled, and the nucleus is not very reactive, similar to the noble gases.
—Artemis Spyrou, Discover Magazine, 9 Oct. 2024
See All Example Sentences for noble gas
Cite this Entry
“Noble gas.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/noble%20gas. Accessed 21 Jul. 2025.
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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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