# Mendelevium ## 🧊 Mendelevium · 3D (three.js) <iframe src="https://wikitube-elements.netlify.app/?el=Md&embed=1" width="100%" height="620" frameborder="0" style="border:0;border-radius:12px;overflow:hidden" allowfullscreen loading="lazy" title="The Elements 3D microsim - Mendelevium"></iframe> *Mendelevium 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=Md) <!-- ELEMENTS_MICROSIM:END --> !Mendelevium plate.svg *Plate 101 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.* - Actinides - periodic table row and chemical family - Cyclotron - the machine that makes synthetic elements - Synthetic element - the category that encompasses Mendelevium and the entire transuranic series - [[Alpha_decay|Alpha decay]] - the nuclear process that created Mendelevium in the Berkeley accelerator ## Links (Wikipedia order) <!-- injected from _registry/childlinks/Mendelevium.json (2026-07-30T02:09:12Z) --> `1,000,000,000` · `Actinide` · [[Actinium]] · `Albert_Ghiorso` · `Alkali_metal` · `Alkaline_earth_metal` · [[Alpha_decay]] · [[Alpha_particle]] · [[Aluminium]] · [[Americium]] · [[Antimony]] · `Aqua_regia` · [[Argon]] · [[Arsenic]] · [[Astatine]] · `Atomic_number` · [[Barium]] · `Becquerel` · [[Berkelium]] · [[Beryllium]] · [[Beta_decay]] · [[Bismuth]] · `Block_(periodic_table)` · [[Bohrium]] · [[Boron]] · `Boron_group` · [[Bromine]] · `CAS_Registry_Number` · [[Cadmium]] · [[Caesium]] · [[Calcium]] · [[Californium]] · [[Carbon]] · `Carbon_group` · [[Cerium]] · `Chalcogen` · `Chemical_symbol` · `Chloride` · [[Chlorine]] · `Chromatography` · [[Chromium]] · [[Cobalt]] · [[Cold_War]] · `Coordination_complex` · `Coordination_number` · [[Copernicium]] · [[Copper]] · `Coprecipitation` · [[Crystal_structure]] · [[Cubic_crystal_system]] · [[Curium]] · `Cyclotron` · [[Darmstadtium]] · [[Decay_product]] · [[Density]] · `Dmitri_Mendeleev` · [[Dubnium]] · [[Dysprosium]] · [[Einsteinium]] · `Electron_capture` · `Electron_configuration` · `Electronegativity` · `Electronvolt` · `Elution` · `Enthalpy` · `Enthalpy_of_sublimation` · [[Erbium]] · `Ethanol` · [[Europium]] · [[Fermium]] · [[Flerovium]] · `Fluoride` · [[Fluorine]] · [[Francium]] · [[Gadolinium]] · [[Gallium]] · [[Germanium]] · `Glenn_T._Seaborg` · [[Gold]] · `Gregory_Robert_Choppin` · `Group_(periodic_table)` · `Group_10_element` · `Group_11_element` · `Group_12_element` · `Group_3_element` · `Group_4_element` · `Group_5_element` · `Group_6_element` · `Group_7_element` · `Group_8_element` · `Group_9_element` · [[Hafnium]] · [[Half-life]] · `Halogen` · [[Hassium]] · [[Helium]] · [[Holmium]] · `Homologous_series` · `Hydrochloric_acid` · [[Hydrogen]] · `Hydrogen_peroxide` · `Hydroxide` · [[Indium]] · `International_Commission_on_Radiological_Protection` · `International_Union_of_Pure_and_Applied_Chemistry` · [[Iodine]] · [[Ionization_energy]] · [[Iridium]] · [[Iron]] · `Isotopes_of_fermium` · `Isotopes_of_mendelevium` · `Kelvin` · [[Krypton]] · `Lanthanide` · [[Lanthanum]] · `Lawrence_Berkeley_National_Laboratory` · [[Lawrencium]] · [[Lead]] · [[Liquid_helium]] · `List_of_chemical_element_name_etymologies` · `List_of_data_references_for_chemical_elements` · [[Lithium]] · [[Livermorium]] · [[Lutetium]] · `Macroscopic_scale` · [[Magnesium]] · [[Manganese]] · `Mass_number` · [[Meitnerium]] · `Melting_point` · [[Mercury_(element)]] · `Microgram` · [[Molybdenum]] · `Momentum` · [[Moscovium]] · `Natural_abundance` · [[Neodymium]] · [[Neon]] · [[Neptunium]] · [[Neutron]] · [[Nickel]] · [[Nihonium]] · [[Niobium]] · `Nitric_acid` · [[Nitrogen]] · [[Nobelium]] · [[Noble_gas]] · `Norman_Greenwood` · `Nuclear_reaction` · [[Oganesson]] · [[Osmium]] · `Oxidation_state` · [[Oxygen]] · [[Palladium]] · `Particle_accelerator` · `Period_(periodic_table)` · `Period_1_element` · `Period_2_element` · `Period_3_element` · `Period_4_element` · `Period_5_element` · `Period_6_element` · `Period_7_element` · `Periodic_table` · `Phase_(matter)` · [[Phosphorus]] · [[Platinum]] · [[Plutonium]] · `Pnictogen` · [[Polonium]] · [[Potassium]] · `Potassium_chloride` · [[Praseodymium]] · [[Promethium]] · [[Protactinium]] · [[Radioactive_decay]] · [[Radium]] · [[Radon]] · `Redox` · `Relativistic_quantum_chemistry` · `Resin` · [[Rhenium]] · [[Rhodium]] · [[Roentgenium]] · `Room_temperature` · [[Rubidium]] · [[Ruthenium]] · [[Rutherfordium]] · [[Samarium]] · [[Scandium]] · [[Seaborgium]] · [[Selenium]] · [[Silicon]] · [[Silver]] · [[Sodium]] · `Sodium_bismuthate` · [[Spontaneous_fission]] · `Standard_temperature_and_pressure` · [[Strontium]] · [[Sulfur]] · `Synthetic_element` · `Synthetic_radioisotope` · [[Tantalum]] · [[Technetium]] · [[Tellurium]] · [[Tennessine]] · [[Terbium]] · `Term_symbol` · `Test_tube` · [[Thallium]] · [[Thermodynamics]] · [[Thorium]] · [[Thulium]] · `Timeline_of_chemical_element_discoveries` · [[Tin]] · [[Titanium]] · `Transuranium_element` · [[Tungsten]] · `United_States` · `University_of_California` · `University_of_California,_Berkeley` · [[Uranium]] · `Valence_electron` · [[Vanadium]] · [[Xenon]] · [[Ytterbium]] · [[Yttrium]] · [[Zinc]] · [[Zirconium]] > **Official MAIN - Chemical element, Z = 101.** 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: Mendelevium](https://en.wikipedia.org/wiki/Mendelevium). <!-- ELEMENTS_MICROSIM:BEGIN (auto-managed block - edits inside will be overwritten) --> ## Key facts (infobox) | | | |---|---| | Symbol - Z | Md - 101 | | Group - Period - Block | f - 7 - f-block | | Atomic weight (Da) | [258] | | Density (g/cm3) | (10.3) | | Melting - Boiling (K) | (1100) - - | | Electronegativity (Pauling) | 1.3 | | Crustal abundance (mg/kg) | - | | Origin | synthetic | | Phase (STP) | unknown | | Name origin | Dmitri Mendeleev, who predicted this canon | *Bracketed weights are the mass number of the most stable isotope; values in parentheses are predictions (per the source table).* ## Story Mendelevium was first synthesized in 1955 at the Lawrence Berkeley Laboratory (now Lawrence Berkeley National Laboratory) by Glenn T. Seaborg and colleagues, created through the bombardment of einsteinium-253 with alpha particles in a cyclotron. The discovery closed a symbolic loop: Dmitri Mendeleev, the Russian chemist whose periodic table predicted the gap where Technetium would belong, now had an element named in his honor—a synthetic element that could never be found in nature, only made. Like all transuranic elements, Mendelevium exists only as synthesized isotopes, with Md-258 being the longest-lived at approximately 51 days [model-prior - verify]. The chemical properties of Mendelevium have been inferred rather than directly observed, as the quantities and half-lives are too brief for traditional chemistry [model-prior - verify]. It is expected to display the +3 oxidation state characteristic of the actinides, though its precise electronegativity and ionic behavior remain largely predicted. The element occupies the f-block, continuing the actinide series that Technetium initiated in human hands—a lineage of human-made atomic order. The naming carries weight in the corpus of synthetic elements: Mendelevium honors the man whose table-gap made Technetium conceivable. Together, they frame the fundamental shift from elements as givens to elements as human creations, fulfilling a theoretical prediction through experimental mastery. ## 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 - [Glenn T. Seaborg](https://en.wikipedia.org/wiki/Glenn_T._Seaborg) - co-discoverer and namesake of Seaborgium (Z 106) ## Vocational-Technical Semiotics The element speaks the canon's shared signs: the periodic table cell (Md, group f, period 7), 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: [[Fermium|Fermium (100)]] - [[Nobelium|Nobelium (102)]] - R.E.A.C.T.I.O.N. - Centers of Excellence ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Mendelevium) : [Wikitube](https://en.wikitube.io/wiki/Mendelevium) ## Previous hub tags Tree parents: [[Helium]] · [[Hydrogen]] · [[Oxygen]]. Legacy hubs: none. --- *Sources: 1 legacy note. Minted wave 1, 2026-07-30 (v1.6 order).*