Lanthanum - Wikiparency

# Lanthanum ## 🧊 Lanthanum · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=La&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Lanthanum"></iframe> *Lanthanum 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=La)  !Lanthanum plate.svg *Plate 57 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.* - Lanthanide - the f-block rare-earth series - Catalytic converter - rare-earth catalysts - Flint - lanthanum in lighter alloys - Rare-earth element - mining and supply ## Links (Wikipedia order)  [[Actinium]] · `Alkali_metal` · `Alkaline_earth_metal` · [[Aluminium]] · [[Americium]] · `Ammonium_chloride` · `Ammonium_oxalate` · `Ancient_Greek` · `Anisotropy` · [[Antimony]] · [[Argon]] · [[Arsenic]] · [[Astatine]] · `Atomic_number` · `Atomic_radius` · `Atzgersdorf` · `Axel_Fredrik_Cronstedt` · [[Barium]] · `Bastnäs` · `Bastnäsite` · [[Berkelium]] · [[Beryllium]] · [[Bismuth]] · `Block_(periodic_table)` · [[Bohrium]] · [[Boiling_point]] · [[Boron]] · `Boron_group` · `Brinell_hardness_test` · [[Bromine]] · `Bulk_modulus` · `CAS_Registry_Number` · [[Cadmium]] · [[Caesium]] · [[Calcium]] · `Calcium_fluoride` · `Calcium_oxide` · [[Californium]] · `Camera` · [[Carbon]] · `Carbon_dioxide` · `Carbon_group` · `Carbonate` · `Carl_Auer_von_Welsbach` · 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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: Lanthanum](https://en.wikipedia.org/wiki/Lanthanum).  ## Key facts (infobox) | | | |---|---| | Symbol - Z | La - 57 | | Group - Period - Block | f - 6 - f-block | | Atomic weight (Da) | 138.91 | | Density (g/cm3) | 6.162 | | Melting - Boiling (K) | 1193 - 3737 | | Electronegativity (Pauling) | 1.1 | | Crustal abundance (mg/kg) | 39 | | Origin | primordial | | Phase (STP) | solid | | Name origin | Greek lanthanein, 'to lie hidden' | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Lanthanum was discovered in 1839 by Swedish chemist Carl Gustaf Mosander as an impurity in cerium oxide. Its name derives from Greek lanthanein, meaning to lie hidden, reflecting its discovery as a hidden component of another rare-earth element. Lanthanum is moderately abundant among rare earths (39 mg/kg) and is extracted as a major constituent of monazite and bastnasite ores. Lanthanum is a soft, silvery metal that readily oxidizes in air. It is pyrophoric (ignites spontaneously) in finely divided form. [model-prior - verify] Lanthanum's primary industrial use is in flint and lighter alloys, where it provides sparking properties. Lanthanum compounds are catalysts in petroleum refining (fluid catalytic crackers) and in hydrocarbon conversion reactions. Lanthanum-doped ceria (CeO₂) serves as an oxygen-transport material in automotive catalytic converters. [model-prior - verify] The corpus engages lanthanum as the threshold element of the lanthanide series—the gateway to f-block chemistry and the rare-earth economy that drives modern materials and catalysis. ## 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 - Solar System Mining Surveys - rare-earth elements and critical materials ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (La, 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: [[Barium|Barium (56)]] - [[Cerium|Cerium (58)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Lanthanum) : [Wikitube](https://en.wikitube.io/wiki/Lanthanum) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*