# Gadolinium ## 🧊 Gadolinium · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=Gd&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Gadolinium"></iframe> *Gadolinium 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=Gd) <!-- ELEMENTS_MICROSIM:END --> !Gadolinium plate.svg *Plate 64 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.* - Gadolinium-based contrast agent - MRI enhancement and tissue imaging - [[Magnetic_resonance_imaging|Magnetic resonance imaging]] - clinical diagnostic applications - Nuclear reactor - control rods and neutron absorption - Paramagnetism - gadolinium's exceptional magnetic moment ## Links (Wikipedia order) <!-- injected from _registry/childlinks/Gadolinium.json (2026-07-30T02:09:12Z) --> `APT40` · `Actinide` · [[Actinium]] · `Alkali_metal` · `Alkaline_earth_metal` · [[Alloy]] · [[Alpha_decay]] · [[Aluminium]] · [[Americium]] · `Ammonium_oxalate` · `Anisotropy` · `Antiferromagnetism` · [[Antimony]] · [[Argon]] · [[Arsenic]] · [[Astatine]] · `Asthma` · `Atomic_number` · `Atomic_radius` · [[Barium]] · `Barn_(unit)` · `Bastnäsite` · [[Berkelium]] · [[Beryllium]] · [[Beta_decay]] · [[Bismuth]] · `Block_(periodic_table)` · `Blood–brain_barrier` · [[Bohrium]] · [[Boiling_point]] · [[Boron]] · `Boron_group` · [[Bromine]] · `Brookhaven_National_Laboratory` · 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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: Gadolinium](https://en.wikipedia.org/wiki/Gadolinium). <!-- ELEMENTS_MICROSIM:BEGIN (auto-managed block - edits inside will be overwritten) --> ## Key facts (infobox) | | | |---|---| | Symbol - Z | Gd - 64 | | Group - Period - Block | f - 6 - f-block | | Atomic weight (Da) | 157.25 | | Density (g/cm3) | 7.90 | | Melting - Boiling (K) | 1585 - 3546 | | Electronegativity (Pauling) | 1.2 | | Crustal abundance (mg/kg) | 6.2 | | Origin | primordial | | Phase (STP) | solid | | Name origin | gadolinite, after chemist Johan Gadolin | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Gadolinium was discovered in 1880 by Jean-Charles Galissard de Marignac, who extracted it from gadolinite ore, itself named after the chemist Johan Gadolin [model-prior - verify]. It is the eighth element of the lanthanide series and the first member to complete the filling of the 4f electron shell, giving it unique magnetic and electronic properties. Like other rare earths, gadolinium's full-scale industrial supply remained scarce until the 20th century. The element exhibits exceptional magnetic properties and holds the highest magnetic moment of any element at room temperature [model-prior - verify]. Gadolinium's thermal neutron absorption cross-section is enormous, making it invaluable in nuclear reactor control rods. In medicine, gadolinium-based contrast agents (particularly gadolinium chelate complexes) are widely used in magnetic resonance imaging (MRI) to enhance soft-tissue visibility and detect tumors, lesions, and blood-flow abnormalities [model-prior - verify]. Gadolinium's dual role—as both a nuclear-control and medical-imaging material—reflects the corpus's interest in technologies that harness elemental physics for human safety and health. Its neutron-absorption role ties it indirectly to space-mining and reactor design; its medical applications speak to the instrumental reach of rare earths into clinical practice. ## Corpus connections - 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 - Space Mining In Minnesota - rare-earth supply for reactor and medical systems - History of Mining in Minnesota - critical materials for healthcare infrastructure ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (Gd, group f, 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: [[Europium|Europium (63)]] - [[Terbium|Terbium (65)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Gadolinium) : [Wikitube](https://en.wikitube.io/wiki/Gadolinium) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*