# Astatine ## 🧊 Astatine · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=At&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Astatine"></iframe> *Astatine 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=At) <!-- ELEMENTS_MICROSIM:END --> !Astatine plate.svg *Plate 85 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.* - Halogen - the family of reactive nonmetals, astatine as the heaviest member - [[Radioactive_decay|Radioactive decay]] - astatine appears transiently in uranium and thorium series - Nuclear transmutation - Segré's synthesis of astatine via alpha bombardment - [[Half-life|Half-life]] - astatine-210 and the limits of tracer chemistry ## Links (Wikipedia order) <!-- injected from _registry/childlinks/Astatine.json (2026-07-30T02:09:12Z) --> `Aaldert_Wapstra` · `Abundance_of_elements_in_Earth's_crust` · [[Actinium]] · `Adenocarcinoma` · `Alice_Leigh-Smith` · `Alkali_metal` · `Alkaline_earth_metal` · [[Alpha_decay]] · [[Alpha_particle]] · [[Aluminium]] · [[Americium]] · `Analytical_chemistry` · `Ancient_Greek` · `Antibody` · [[Antimony]] · [[Argon]] · [[Arsenic]] · `Astatine_bromide` · `Astatine_compounds` · `Astatine_iodide` · `Astatobenzene` · `Atomic_Data_and_Nuclear_Data_Tables` · `Atomic_electron_transition` · `Atomic_number` · `Atomic_orbital` · 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Infobox grounded in [Wikipedia: List of chemical elements](https://en.wikipedia.org/wiki/List_of_chemical_elements), fetched 2026-07-08. Full article: [Wikipedia: Astatine](https://en.wikipedia.org/wiki/Astatine). <!-- ELEMENTS_MICROSIM:BEGIN (auto-managed block - edits inside will be overwritten) --> ## Key facts (infobox) | | | |---|---| | Symbol - Z | At - 85 | | Group - Period - Block | 17 - 6 - p-block | | Atomic weight (Da) | [210] | | Density (g/cm3) | (8.91-8.95) | | Melting - Boiling (K) | 575 - 610 | | Electronegativity (Pauling) | 2.2 | | Crustal abundance (mg/kg) | 3e-20 | | Origin | from decay | | Phase (STP) | unknown | | Name origin | Greek astatos, 'unstable' - it has no stable isotopes | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Astatine was the first artificially created element (later natural examples were detected), synthesized in 1940 by Emilio Segré and his colleagues at the University of California by bombarding bismuth with alpha particles. The element's name, from Greek *astatos* meaning "unstable," reflects its defining characteristic: no stable isotopes exist, and all known isotopes are extremely short-lived. The most stable isotope, astatine-210, has a half-life of only about 8.1 hours. [model-prior - verify] Astatine is a halogen, grouped with fluorine, chlorine, bromine, and iodine. Despite its brief existence, it exhibits expected halogen chemistry and forms compounds similar to iodine. Because no substantial quantities of astatine can be accumulated, its chemistry has only been studied in trace amounts using radioactive techniques. It has no commercial applications due to its extreme rarity and radioactive instability. In the Elements Canon, astatine represents the outer edge of human-accessible chemistry: rarer than radium, shorter-lived than most fission products, yet still chemically knowable through clever experimentation. It marks the point where tradition chemistry encounters the limits of modern nuclear physics. ## Corpus connections Astatine is a halogen—the heaviest and most radioactive of the halogen family. It appears in the uranium and thorium decay chains at trace levels. - 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 - [Halogen](https://en.wikipedia.org/wiki/Halogen) - astatine is the heaviest and most unstable halogen - [Particle accelerator](https://en.wikipedia.org/wiki/Particle_accelerator) - astatine was first synthesized by bombarding bismuth ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (At, group 17, 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: [[Polonium|Polonium (84)]] - [[Radon|Radon (86)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Astatine) : [Wikitube](https://en.wikitube.io/wiki/Astatine) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*