Lutetium - Wikiparency

# Lutetium ## 🧊 Lutetium · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=Lu&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Lutetium"></iframe> *Lutetium 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=Lu)  !Lutetium plate.svg *Plate 71 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.* - Positron emission tomography - lutetium-based PET scintillators - Scintillator - lutetium oxyorthosilicate crystal for medical imaging - Lanthanide - end of the 4f series and transition to d-block - Element discovery - late-20th-century isolation techniques ## Links (Wikipedia order)  [[Actinium]] · `Adsorption` · `Aldebaran` · `Alkali_metal` · `Alkaline_earth_metal` · [[Alloy]] · [[Aluminium]] · [[Americium]] · `Ammonium_nitrate` · `Ammonium_oxalate` · `Annealing_(materials_science)` · [[Antimony]] · [[Argon]] · [[Arsenic]] · [[Astatine]] · `Atomic_number` · `Atomic_radius` · [[Barium]] · [[Berkelium]] · [[Beryllium]] · [[Beta_decay]] · [[Bismuth]] · `Block_(periodic_table)` · [[Bohrium]] · [[Boiling_point]] · [[Boron]] · `Boron_group` · `Brinell_hardness_test` · [[Bromine]] · `Bulk_modulus` · `CAS_Registry_Number` · [[Cadmium]] · [[Caesium]] · [[Calcium]] · [[Californium]] · [[Carbon]] · `Carbon_dioxide` · `Carbon_group` · `Carl_Auer_von_Welsbach` · 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`Lutetium(III)_nitrate` · `Lutetium(III)_oxide` · `Lutetium(III)_telluride` · `Lutetium_(177Lu)_chloride` · `Lutetium_(177Lu)_oxodotreotide` · `Lutetium_(177Lu)_vipivotide_tetraxetan` · `Lutetium_acetylacetonate` · `Lutetium_aluminium_garnet` · `Lutetium_compounds` · `Lutetium_iodate` · `Lutetium_nitride` · `Lutetium_phosphide` · `Lutetium_phthalocyanine` · `Lutetium_tantalate` · `Lutetium_vanadate` · `Lutetium–hafnium_dating` · `Lutetium–yttrium_oxyorthosilicate` · [[Magnesium]] · `Magnetism` · [[Manganese]] · `Mary_Elvira_Weeks` · `Mass_number` · [[Meitnerium]] · `Melting_point` · [[Mendelevium]] · [[Mercury_(element)]] · `Metal` · `Meteorite` · `Molar_heat_capacity` · [[Molybdenum]] · `Monazite` · `Monoisotopic_element` · [[Moscovium]] · `Motexafin_lutetium` · `Natural_abundance` · [[Neodymium]] · [[Neon]] · [[Neptunium]] · `Neutron_activation` · [[Nickel]] · `Niels_Bohr` · [[Nihonium]] · [[Niobium]] · `Nitric_acid` · [[Nitrogen]] · [[Nobelium]] · [[Noble_gas]] · `Norman_Greenwood` 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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: Lutetium](https://en.wikipedia.org/wiki/Lutetium).  ## Key facts (infobox) | | | |---|---| | Symbol - Z | Lu - 71 | | Group - Period - Block | 3 - 6 - d-block | | Atomic weight (Da) | 174.97 | | Density (g/cm3) | 9.841 | | Melting - Boiling (K) | 1925 - 3675 | | Electronegativity (Pauling) | 1.27 | | Crustal abundance (mg/kg) | 0.8 | | Origin | primordial | | Phase (STP) | solid | | Name origin | Latin Lutetia, 'Paris' | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Lutetium was discovered in 1907 by French chemist Georges Urbain (and independently by Carl Auer von Welsbach), making it one of the last naturally occurring elements to be isolated [model-prior - verify]. Its name derives from Lutetia, the Latin name for Paris, reflecting Urbain's French research context. Lutetium sits at the boundary between the lanthanides and the d-block transition metals, marking the end of the 4f electron series and the beginning of the 5d series. The element is a silvery lanthanide with the highest density and hardest nature of the lanthanide series, properties that reflect its full 4f shell [model-prior - verify]. Lutetium is used in phosphor materials, including those in medical imaging (particularly in PET scanners combined with fluorodeoxyglucose tracers), and in specialized permanent magnets [model-prior - verify]. It has also appeared in catalysts and in some advanced optical materials. Despite its rarity and late discovery, lutetium has found niche but critical roles in modern imaging and healthcare. Lutetium's late discovery underscores how even in the modern era, rare earths retain the capacity to surprise: its discovery came decades after technetium's synthesis, yet lutetium was always present in the Earth's crust, simply waiting for improved separation chemistry to reveal it. ## 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 medical imaging - History of Mining in Minnesota - the last lanthanide and healthcare materials ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (Lu, group 3, 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: [[Ytterbium|Ytterbium (70)]] - [[Hafnium|Hafnium (72)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Lutetium) : [Wikitube](https://en.wikitube.io/wiki/Lutetium) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*