# Terbium ## 🧊 Terbium · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=Tb&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Terbium"></iframe> *Terbium 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=Tb) <!-- ELEMENTS_MICROSIM:END --> !Terbium plate.svg *Plate 65 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.* - Permanent magnet - terbium-doped neodymium magnets - Hard disk drive - rare-earth magnets and data storage - Green laser - terbium phosphors and frequency doubling - Ytterby - the Swedish quarry and four rare earths ## Links (Wikipedia order) <!-- injected from _registry/childlinks/Terbium.json (2026-07-30T02:09:12Z) --> [[Actinium]] · `Actuator` · `Adsorption` · `Alkali_metal` · `Alkaline_earth_metal` · `Allotropy` · [[Alloy]] · [[Aluminium]] · `American_Conference_of_Governmental_Industrial_Hygienists` · [[Americium]] · `Ammonium_nitrate` · `Ammonium_oxalate` · `Annealing_(materials_science)` · [[Antimony]] · [[Argon]] · [[Arsenic]] · [[Astatine]] · `Atomic_number` · `Atomic_radius` · [[Barium]] · [[Berkelium]] · [[Beryllium]] · [[Bismuth]] · `Block_(periodic_table)` · [[Bohrium]] · [[Boiling_point]] · [[Boron]] · `Boron_group` · `Brinell_hardness_test` · `Bromide` · [[Bromine]] · `Bulk_modulus` · `CAS_Registry_Number` · [[Cadmium]] · [[Caesium]] · 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[[Tantalum]] · [[Technetium]] · [[Tellurium]] · [[Tennessine]] · `Terbium(III)_bromide` · `Terbium(III)_chloride` · `Terbium(III)_fluoride` · `Terbium(III)_iodide` · `Terbium(III)_oxide` · `Terbium(III,IV)_oxide` · `Terbium(IV)_fluoride` · `Terbium(IV)_oxide` · `Terbium_acetate` · `Terbium_monoselenide` · `Terbium_monosulfide` · `Terbium_nitride` · `Terbium_oxyfluoride` · `Terbium_phosphide` · `Terfenol-D` · [[Thallium]] · [[Thorium]] · [[Thulium]] · `Timeline_of_chemical_element_discoveries` · [[Tin]] · [[Titanium]] · `Toxicology` · `Tricapped_trigonal_prismatic_molecular_geometry` · `Tungstate` · [[Tungsten]] · `United_States_Geological_Survey` · [[Uranium]] · `Valence_electron` · [[Vanadium]] · `Vapor_pressure` · `Vickers_hardness_test` · `Water` · `X-ray` · [[Xenon]] · `Xenotime` · `Young's_modulus` · [[Ytterbium]] · `Ytterby` · [[Yttrium]] · `Yttrium(III)_oxide` · [[Zinc]] · [[Zirconium]] · `Zirconium_dioxide` · `Zone_melting` > **Official MAIN - Chemical element, Z = 65.** 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: Terbium](https://en.wikipedia.org/wiki/Terbium). <!-- ELEMENTS_MICROSIM:BEGIN (auto-managed block - edits inside will be overwritten) --> ## Key facts (infobox) | | | |---|---| | Symbol - Z | Tb - 65 | | Group - Period - Block | f - 6 - f-block | | Atomic weight (Da) | 158.93 | | Density (g/cm3) | 8.23 | | Melting - Boiling (K) | 1629 - 3503 | | Electronegativity (Pauling) | 1.2 | | Crustal abundance (mg/kg) | 1.2 | | Origin | primordial | | Phase (STP) | solid | | Name origin | Ytterby, Sweden | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Terbium was first isolated in 1843 by Swedish chemist Carl Gustaf Mosander from yttrium oxide, and later independently rediscovered by other chemists throughout the 19th century. The element is named for the town of Ytterby near Stockholm, Sweden, where a quarry contained an extraordinary concentration of rare-earth ores that yielded four distinct lanthanide elements: terbium, erbium, dysprosium, and holmium [model-prior - verify]. This single Swedish locality became the namesake for three elements, underscoring the deep clustering of rare earths in certain geologic formations. Terbium is a silvery lanthanide with unusually high magnetic properties and significant thermal neutron-absorption capability [model-prior - verify]. It has found specialized applications in high-performance permanent magnets (particularly in neodymium-terbium alloys for hard drives and permanent magnets), solid-state lasers, and as a dopant in phosphors for green laser pointers and fluorescent lamps [model-prior - verify]. Like gadolinium, terbium is also used in nuclear reactor control systems. The convergence of four rare earths from Ytterby speaks to the corpus's geological and historical interests: it illustrates how elemental abundance patterns cluster regionally, how a single deposit shaped centuries of chemistry, and how the scarcity and concentration of rare earths continue to drive geopolitics and technology today. ## 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 chain and Ytterby parallels - History of Mining in Minnesota - geologic clustering of critical minerals ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (Tb, 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: [[Gadolinium|Gadolinium (64)]] - [[Dysprosium|Dysprosium (66)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Terbium) : [Wikitube](https://en.wikitube.io/wiki/Terbium) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*