Definition
Neutronium is a hypothetical substance made purely of neutrons. The word was coined by scientist Andreas von Antropoff in 1926 for the hypothetical "element of atomic number zero" that he placed at the head of the periodic table.
Related concepts
Abundance of the chemical elementsActiniumAlkali metalAlkaline earth metalAluminiumAmericiumAndreas von AntropoffAnomalous X-ray pulsarAntimonyArgonArsenicAstatineAsteroseismologyAtomic numberBariumBe/X-ray binaryBerkeliumBerylliumBinary pulsarBismuthBlitzarBohriumBondi accretionBoronBoron groupBromineCadmiumCaesiumCalciumCaliforniumCarbonCarbon groupCentaurus X-3CeriumChalcogenChandra X-ray ObservatoryChandrasekhar limitCharles JanetChemical elementChlorineChromiumCobaltCompact starCompton Gamma Ray ObservatoryCoperniciumCopperCuriumD-blockDarmstadtiumDiscovery of the neutronDubniumDysprosiumEdgar EmersonEinsteiniumElectronErbiumEuropiumExotic nucleiExotic starF-blockFast radio burstFermi Gamma-ray Space TelescopeFermiumFleroviumFluorineFoundations of ChemistryFranciumGadoliniumGail McLaughlinGalliumGamma-ray burstGamma-ray burst progenitorsGermaniumGlitch (astronomy)GoldGroup 10 elementGroup 11 elementGroup 12 elementGroup 3 elementGroup 4 elementGroup 5 elementGroup 6 elementGroup 7 elementGroup 8 elementGroup 9 elementHafniumHalogenHassiumHeliumHolmiumHulse–Taylor pulsarHydrogenHypernovaIndiumIodineIridiumIronJohn Drury ClarkJournal of Physics GKilonovaKryptonLanthanumLawrenciumLeadList of X-ray pulsarsList of most massive neutron starsList of neutron starsLithiumLivermoriumLutetiumMagnesiumMagnetarManganeseMeitneriumMendeleviumMercury (element)MicroquasarMillisecond pulsarMolybdenumMoscoviumNeodymiumNeonNeptuniumNeutronNeutron-star oscillationNeutron degenerate matterNeutron matterNeutron starNeutron star mergerNeutron star spin-upNeutron stars in fictionNeutronsNickelNihoniumNiobiumNitrogenNobeliumNoble gasNucleosynthesisOganessonOptical pulsarOsmiumOxygenP-blockPSR B1919+21PalladiumPeriod 1 elementPeriod 2 elementPeriod 3 elementPeriod 4 elementPeriod 5 elementPeriod 6 elementPeriod 7 elementPeriodic tablePhosphorusPhysical Review CPhysical Review DPhysical Review LettersPhysics (American Physical Society magazine)Physics Letters BPhysics ReportsPlatinumPlutoniumPnictogenPoloniumPotassiumPraseodymiumPromethiumProtactiniumProtonPulsarPulsar kickPulsar planetPulsar wind nebulaQCD matterQuark-novaQuark starQuasi-periodic oscillationRadio-quiet neutron starRadio starRadiumRadonRelativistic starRheniumRhodiumRoentgeniumRossi X-ray Timing ExplorerRotating radio transientRp-processRubidiumRutheniumRutherfordiumS-blockSamariumScandiumSeaborgiumSeleniumSiliconSilverSodiumSoft gamma repeaterStarquake (astrophysics)Stellar black holeStrontiumSulfurSupernovaSupernova remnantTantalumTechnetiumTelluriumTennessineTerbiumTetraneutronThalliumThe Magnificent Seven (neutron stars)ThoriumThorne–Żytkow objectThuliumTimeline of white dwarfs, neutron stars, and supernovaeTinTitaniumTolman–Oppenheimer–Volkoff limitTungstenUraniumUrca processVanadiumWhite dwarfX-ray binaryX-ray bursterX-ray pulsarX-ray pulsar-based navigationXenonYtterbiumYttriumZeitschrift für Angewandte ChemieZincZirconium
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