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The 146 pages that link to Isotope, each with the reason it gives.

• Rubidium-87Narrower topic: Rubidium-87 is one isotope among rubidium’s naturally occurring forms.

• SeaborgiumRelated: Known seaborgium atoms are isotopes with different nuclear lifetimes.

• BerkeliumRelated: Berkelium exists as radioactive isotopes rather than stable, naturally abundant atoms.

• FranciumNarrower topic: Francium has no stable isotopes; its different forms decay at different rates.

• GadoliniumNarrower topic: Gadolinium’s isotopes differ in neutron count and have distinct nuclear properties.

• Isochron datingNarrower topic: The method distinguishes isotopes of the same elements by their measured ratios.

• Isotope separationNarrower topic: Separation distinguishes isotopes while preserving their shared elemental identity.

• Lead(II) ionRelated: Lead isotopes can all form Pb²⁺ despite differing in neutron count.

• ProtiumNarrower topic: The isotope concept explains how protium differs from other hydrogen atoms.

• George de HevesyNarrower topic: Tracer experiments exploit isotopes' shared chemistry and differing nuclear properties.

• Harold UreyNarrower topic: Deuterium differs from ordinary hydrogen by one neutron.

• Nuclear chemistryBroader topic: Isotopes share chemical identity while differing in nuclear mass and often stability.

• Presolar grainNarrower topic: Presolar grains are identified chiefly by isotope ratios unlike those in Solar System materials.

• PromethiumNarrower topic: Promethium has no stable isotopes, so its isotopes determine its existence and uses.

• RutherfordiumNarrower topic: Rutherfordium is known only through radioactive isotopes with different neutron counts.

• Standard atomic weightRelated: An element’s isotopes have different masses, creating variation in its standard atomic weight.

• RheniumRelated: Natural rhenium consists mainly of rhenium-187 and the stable isotope rhenium-185.

• CaesiumRelated: Caesium has multiple isotopes, while caesium-133 is its only stable one.

• Discovery of the neutronNarrower topic: Isotopes had different masses despite sharing an element’s charge, sharpening the need for a neutral nuclear constituent.

• FermiumRelated: Known fermium atoms differ chiefly by isotope, with different nuclear stability and lifetimes.

• Isotopes of oxygenNarrower topic: Oxygen-16, oxygen-17, and oxygen-18 are members of this broader class.

• Synthetic elementNarrower topic: Synthetic elements are usually first detected as particular isotopes, not as bulk substances.

• Carbon isotopesNarrower topic: Carbon isotopes are specific instances of this general atomic relationship.

• Clifford ShullRelated: Isotopes can scatter neutrons differently, enabling contrasts between otherwise similar atoms.

• Francis William AstonNarrower topic: Isotopes were the distinct atomic forms Aston separated and identified.

• History of atomic theoryBroader topic: Their discovery showed that atoms of one element need not all have identical mass.

• LivermoriumRelated: Livermorium is known through particular isotopes, not through a stable natural form.

• MeitneriumRelated: Observed meitnerium atoms differ in neutron count and are identified as separate isotopes.

• MendeleviumNarrower topic: Mendelevium is known through its isotopes, which differ in stability and nuclear properties.

• Neutron imagingRelated: Isotopes of one element can interact very differently with neutrons, enabling contrast variation.

• AllotropeCompared with: Isotopes differ in nuclear composition, whereas allotropes differ in atomic arrangement or bonding.

• HassiumRelated: Hassium is known only as radioactive isotopes with different neutron counts.

• NobeliumNarrower topic: Nobelium’s observed properties depend on which of its isotopes is produced.

• Whole-number ruleBroader topic: Each isotope has its own near-integer mass, unlike an element's abundance-weighted average.

• Atomic propertiesBroader topic: Isotopes preserve atomic number while changing mass and sometimes nuclear behavior.

• Composition of astronomical objectsNarrower topic: Isotope identities and proportions add detail beyond a body's elemental inventory.

• Decay productRelated: Products can be isotopes of the parent element or of a different element.

• Elemental materialsRelated: Isotopes remain the same element but can change mass-dependent material behavior.

• Isotopes of nitrogenNarrower topic: Nitrogen-14 and nitrogen-15 are specific members of this broader class.

• Isotopes of uraniumNarrower topic: Uranium isotopes are a specific case of this broader nuclear category.

• Nuclear technologyRelated: Different isotopes can be stable, radioactive, fissile, or useful as tracers.

• Primordial nuclideRelated: Primordial nuclides include individual isotopes, which can differ greatly in stability.

• Radioanalytical chemistryNarrower topic: Isotopic identity distinguishes radionuclides of an element from its stable forms.

• Theodore William RichardsRelated: Isotopes later explained why many measured atomic weights are not whole numbers.

• UnquadbiumRelated: Any unquadbium atoms would have isotopes distinguished by their neutron counts.

• UnquadhexiumRelated: Any produced unquadhexium nucleus would be a particular isotope with its own neutron count.