Radon - Wikiparency

# Radon ## 🧊 Radon · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=Rn&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Radon"></iframe> *Radon in the live three.js Elements explorer — drag to orbit the atom, click any tile to compare, slide the temperature.* · [▶ open full](https://wikitube-elements.netlify.app/?el=Rn)  !Radon plate.svg *Plate 86 of 118 - animated Bohr shells, stylized per Madelung filling; engraving style per house Arcanity kit.* ## Microsim To Do *Claimable rows, house pattern. Real Wikipedia articles only.* - [[Decay_chain|Decay chain]] - radon-222 in the uranium-238 series - [[Noble_gas|Noble gas]] - radon as the heaviest and radioactive noble gas - Radon testing - measuring indoor radon levels and remediation - [[Alpha_decay|Alpha decay]] - radon and its daughters emit alpha radiation to the lungs ## Links (Wikipedia order)  `Ab_initio_quantum_chemistry_methods` · [[Actinium]] · `Adenocarcinoma` · `Agency_for_Toxic_Substances_and_Disease_Registry` · `Air_mass` · `Alkali_metal` · `Alkaline_earth_metal` · [[Alpha_decay]] · [[Alpha_particle]] · [[Aluminium]] · `American_Cancer_Society` · [[Americium]] · `André-Louis_Debierne` · `Angular_momentum_coupling` · `Antarctica` · [[Antimony]] · `Antimony_pentafluoride` · `Apollo_15` · `Appalachian_Mountains` · `Aqueous_solution` · `Aquifer` · [[Argon]] · [[Arsenic]] · `Arthritis` · [[Astatine]] · `Atmosphere_of_Earth` · `Atomic_number` · `Autoimmune_disease` · `Bad_Kreuznach` · [[Barium]] · `Becquerel` · 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[[Zinc]] · `Zinc_sulfide` · [[Zirconium]] > **Official MAIN - Chemical element, Z = 86.** Part of the Elements Canon (one canonical page per element). Infobox grounded in [Wikipedia: List of chemical elements](https://en.wikipedia.org/wiki/List_of_chemical_elements), fetched 2026-07-08. Full article: [Wikipedia: Radon](https://en.wikipedia.org/wiki/Radon).  ## Key facts (infobox) | | | |---|---| | Symbol - Z | Rn - 86 | | Group - Period - Block | 18 - 6 - p-block | | Atomic weight (Da) | [222] | | Density (g/cm3) | 0.00973 | | Melting - Boiling (K) | 202 - 211.3 | | Electronegativity (Pauling) | 2.2 | | Crustal abundance (mg/kg) | 4e-13 | | Origin | from decay | | Phase (STP) | gas | | Name origin | radium emanation, original name of Rn-222 | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Radon was discovered in 1900 by Friedrich Ernst Dorn as an emanation (radioactive vapor) from radium compounds. It was originally called "radium emanation" before being recognized as a distinct element and formally named radon. The element is a noble gas—chemically inert and colorless—but unlike its stable noble-gas relatives, radon is highly radioactive. Radon-222, the longest-lived naturally occurring isotope, has a half-life of 3.82 days. Radon is a naturally occurring decay product of uranium and thorium in soil and rock. Its gaseous nature means it readily seeps into buildings through cracks in foundations and poorly sealed spaces, accumulating in basements and lower levels. In many regions, radon is the second leading cause of lung cancer (after smoking) because chronic inhalation of radon and its radioactive decay products delivers alpha radiation directly to lung tissue. [model-prior - verify] This makes radon a significant public health concern and building-safety issue in uranium-rich geologies. In the corpus, radon links directly to the uranium-238 decay chain and to environmental-health concerns. It is also the most abundant naturally occurring radioactive element in everyday environments, making it a lived experience of radioactivity for many people. ## Corpus connections Radon is the gaseous decay product of the uranium-238 chain that seeps into buildings. It is a noble gas and an alpha emitter—alpha particles are helium-4 nuclei, tying radon to the corpus's helium-mining connection. - R.E.A.C.T.I.O.N. - the Chemistry hub - Centers of Excellence Portal - [[Technetium|Technetium - the element made before found]] - the canon's patron - and Technitium, the School - [Radon health risks](https://en.wikipedia.org/wiki/Radon#Health_effects) - alpha decay and lung cancer in uranium-rich geologies - [Uranium-238 decay chain](https://en.wikipedia.org/wiki/Decay_chain) - radon-222 from radium-226 decay ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (Rn, group 18, period 6), isotope notation, and hazard pictograms ghs where handling demands it. ## Sources Infobox: [en.wikipedia.org/wiki/List_of_chemical_elements](https://en.wikipedia.org/wiki/List_of_chemical_elements) (fetched 2026-07-08); etymology per the same table's notes. Story sources to be added at enrichment. ## Navigation - Canon: Elements Canon index - neighbors by Z: [[Astatine|Astatine (85)]] - [[Francium|Francium (87)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Radon) : [Wikitube](https://en.wikitube.io/wiki/Radon) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*