Rubidium - Wikiparency

# Rubidium ## 🧊 Rubidium · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=Rb&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Rubidium"></iframe> *Rubidium 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=Rb)  !Rubidium plate.svg *Plate 37 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.* - Spectroscopy and spectroscopic analysis - rubidium's discovery method - Alkali metal reactivity - group 1 chemical behavior and trends - Bose-Einstein condensate - rubidium in cold-atom physics ## Links (Wikipedia order)  `Aaldert_Wapstra` · `Abundance_of_elements_in_Earth's_crust` · [[Actinium]] · `Age_of_the_universe` · `Alkali_metal` · `Alkaline_earth_metal` · [[Alloy]] · [[Aluminium]] · `Amalgam_(chemistry)` · [[Americium]] · `Annalen_der_Physik` · [[Antimony]] · [[Argon]] · [[Arsenic]] · [[Astatine]] · `Atom` · `Atomic_clock` · `Atomic_emission_spectroscopy` · `Atomic_number` · `Atomic_radius` · `Barbara_Goss_Levi` · [[Barium]] · `Becquerel` · [[Berkelium]] · `Bernic_Lake` · [[Beryllium]] · [[Beta_decay]] · `Biological_half-life` · `Biomarker` · [[Bismuth]] · `Block_(periodic_table)` · `Blood–brain_barrier` · [[Bohrium]] · [[Boiling_point]] · [[Boron]] · `Boron_group` · `Bose–Einstein_condensate` · `Brinell_hardness_test` · [[Bromine]] · 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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: Rubidium](https://en.wikipedia.org/wiki/Rubidium).  ## Key facts (infobox) | | | |---|---| | Symbol - Z | Rb - 37 | | Group - Period - Block | 1 - 5 - s-block | | Atomic weight (Da) | 85.468 | | Density (g/cm3) | 1.532 | | Melting - Boiling (K) | 312.46 - 961 | | Electronegativity (Pauling) | 0.82 | | Crustal abundance (mg/kg) | 90 | | Origin | primordial | | Phase (STP) | solid | | Name origin | Latin rubidus, 'deep red' | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Rubidium was discovered in 1861 by German chemists Robert Bunsen and Gustav Kirchhoff in the mineral lepidolite (a lithium aluminum silicate) using the spectroscopic method they had developed years earlier. The element's name comes from the Latin "rubidus," meaning deep red, referring to the distinctive red spectral lines that identified it during spectroscopic analysis. Rubidium was one of the first elements to be discovered via spectroscopy rather than chemical isolation, highlighting the power of the new analytical technique. It remained a laboratory rarity for many decades, with limited practical applications [model-prior - verify]. Rubidium is an alkali metal with exceptionally high reactivity; it reacts violently with water and ignites spontaneously in air [model-prior - verify]. It never occurs in pure form in nature; its principal ores are lepidolite and pollucite (cesium aluminum silicate with rubidium substitution) [model-prior - verify]. Unlike most other heavy alkali metals, rubidium has relatively few large-scale industrial applications. Modern uses include vacuum tubes, photomultiplier tubes, and research applications in atomic and quantum physics, particularly in laser-cooling and Bose-Einstein condensate experiments [model-prior - verify]. In the corpus, rubidium marks the beginning of period 5 and demonstrates how the periodic table's structure predicts chemical reactivity: as one descends a group (here, the alkali metals), reactivity increases progressively. Rubidium's role in quantum physics and cold-atom research connects it to the Technate's information and measurement layers. ## 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 - Technate Expansion schema - rubidium's role in quantum physics and cold-atom research ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (Rb, group 1, period 5), 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: [[Krypton|Krypton (36)]] - [[Strontium|Strontium (38)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Rubidium) : [Wikitube](https://en.wikitube.io/wiki/Rubidium) ## Previous hub tags Tree parents: [[Helium]] · [[Helium-3]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*