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en.wikipedia.org/wiki/Noble_gas

The noble gases make a group of chemical elements with similar properties; under standard .... The noble gases up to xenon have multiple stable isotopes. ... The noble gas atoms, like atoms in most groups, increase steadily in atomic radius .... However, due to the high radioactivity and short half-life of radon isotopes, only ...

en.wikipedia.org/wiki/Noble_gas_compound

Noble gas compounds are chemical compounds that include an element from the noble gases, group 18 of the periodic table. Although the noble gases are generally unreactive elements, many such ... Specifically, he predicted the existence of krypton hexafluoride (KrF6) and xenon hexafluoride (XeF6), speculated that ...

en.wikipedia.org/wiki/Radon

Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas. .... In halogen fluoride solution, radon is involatile and exists as the RnF+ and Rn2+ cations; ... The most stable isotope is 222Rn, which is a decay product ofRa, a decay product ofU. A trace amount ...

en.wikibooks.org/wiki/Structural_Biochemistry/Noble_Gases

The noble gases up to xenon have multiple stable isotopes. ... natural gas, and radon is isolated from the radioactive decay of radium compounds. ... Argon exists in the most common isotopes as Argon 40, Argon 36, Argon 38, and Argon 40.

www.britannica.com/science/noble-gas

Feb 9, 2017 ... Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the ... Radon usually is isolated as a product of the radioactive ... radioactive isotopes (mass numbers), 5–10, 16–19, 23–34, 30–35, 37, 39, 41– ...

authors.library.caltech.edu/25038/211/Chapter%2016.%20Noble%20gas%20isotopes.pdf

taken as evidence for the existence of a primordial reservoir ... The most useful light-noble-gas isotopic ratios ... ancient magmas, corrected for radioactive decay ,.

web.sahra.arizona.edu/programs/isotopes/noble.html

The radioactive isotopes of argon and krypton and the stable isotopes of ... Most of the noble gases have been in the earth's atmosphere since the earth formed.

www.chemistryexplained.com/elements/L-P/Neon.html

In fact, compounds exist for only three noble gases—krypton, radon, and xenon. Chemists have yet to ... The most familiar is neon lighting. Today, neon ... radioactive. None of the radioactive isotopes of neon has any commercial application.

www.chemistryexplained.com/elements/C-K/Krypton.html

Krypton was one of three noble gases discovered in 1898 by Scottish .... English chemist Neil Bartlett (1932-) found ways to combine noble gases with the most active element of all, fluorine. ... Six naturally occurring isotopes of krypton exist. ... A radioactive isotope is one that breaks apart and gives off some form of radiation ...

www.livescience.com/29023-argon.html

Feb 20, 2015 ... (Isotopes of an element have varying numbers of neutrons in the nucleus.) ... 3 stable; Most common isotopes: Ar-40 (99.6035 percent natural abundance), ... Realizing that related elements likely existed, he then found neon, krypton ... They made this discovery by injecting argon and other noble gas tracers ...