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en.wikipedia.org/wiki/Noble_gas

The noble gases make up 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 .... However, due to the high radioactivity and short half-life of radon isotopes, only a  ...

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.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 ..... (For instance, radioactive isotopes of krypton and xenon are difficult to store and dispose, and compounds of these ...

www.encyclopedia.com/science-and-technology/chemistry/compounds-and-elements/noble-gases

Get information, facts, and pictures about Noble gases at Encyclopedia.com. ... Since that time, numerous compounds of xenon with other elements, most notably ... One of the gases was helium—the first confirmation that the element existed on .... Because argon-40 is formed by the radioactive decay of a potassium isotope, ...

www.britannica.com/science/noble-gas

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 decomposition of ... radioactive isotopes (mass numbers), 5–10, 16–19, 23–34, 30–35, 37, 39, 41–  ...

www.britannica.com/science/halogen-element

Fluorine is the most reactive of the halogens and, in fact, of all elements, and it has ... of Pure and Applied Chemistry), the group immediately preceding the noble gases. ... and atmospheric pressure the halogen elements in their free states exist as .... radioactive isotopes (mass numbers), 15–18, 20–31, 28–34, 36, 38–51.

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.

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.chemistryexplained.com/elements/T-Z/Xenon.html

Xenon is a noble gas. The term noble gas is used to describe the elements in Group 18 (VIIIA) of the periodic table. ... Mostly, it is used to fill specialized lamps. SYMBOL Xe ... Isotopes. Nine naturally occurring isotopes of xenon exist. ... Two radioactive isotopes of xenon—xenon-127 and xenon-133—are used in medicine.