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

• Atomic numberRelated: Isotopes share an atomic number but have different numbers of neutrons.

• Radiometric datingNarrower topic: Radioactive and stable isotopes supply the parent and daughter atoms used in age calculations.

• Mass spectrometryRelated: Isotopes create predictable mass patterns that help distinguish elements and molecular compositions.

• Chemical elementBroader topic: Isotopes show why neutron count can vary without changing elemental identity.

• Stable isotope analysisNarrower topic: Stable isotope analysis compares variants of the same element.

• Half-lifeNarrower topic: Radioactive isotopes are the nuclei whose changing abundance half-life describes.

• NeutronRelated: Changing a nucleus's neutron count produces a different isotope of an element.

• Beta decayRelated: Changing proton number turns the original nuclide into another element's isotope.

• Nuclear binding energyRelated: Isotopes of an element can have different masses and binding energies.

• PotassiumRelated: Potassium has several isotopes, including the naturally radioactive potassium-40.

• Atomic nucleusRelated: Isotopes share nuclear charge but differ in nuclear mass and often stability.

• OganessonRelated: Oganesson’s known atoms differ in neutron count while all remain element 118.

• Neutron captureRelated: Adding a neutron usually creates a heavier isotope of the same element.

• GeochronologyNarrower topic: Dating depends on distinguishing parent and daughter isotopes of the same elements.

• IonCompared with: Isotopes differ by neutron count, whereas ions differ by electron count.

• Nuclear physicsNarrower topic: Isotopes expose how changing neutron count alters nuclear stability and properties.

• Uranium–lead datingNarrower topic: The method distinguishes uranium and lead isotopes by their different nuclear masses.

• Isotope geochemistryNarrower topic: Isotopes are the distinct atomic forms whose abundances isotope geochemistry compares.

• Oxygen isotope ratioNarrower topic: An oxygen isotope ratio compares the abundances of two such forms.

• IsomerCompared with: Isotopes differ in neutron count, whereas chemical isomers share elemental composition.

• J. J. ThomsonRelated: Thomson’s positive-ray work revealed neon atoms with different masses, helping establish isotopes.

• John DaltonCompared with: Isotopes disproved Dalton’s claim that all atoms of a given element have identical masses.

• Atomic massRelated: Different isotope proportions give samples of an element different average atomic masses.

• RadioactivityRelated: Isotopes of an element can differ sharply in nuclear stability.

• Uranium-238Narrower topic: Uranium-238 is one isotope among several nuclei with 92 protons.

• Neutron activation analysisNarrower topic: Activation produces radioactive isotopes whose signatures identify the original elements.

• NihoniumRelated: Known nihonium atoms are radioactive isotopes with different neutron counts.

• Uranium-235Narrower topic: Uranium-235 differs from other uranium isotopes by its neutron count.

• Nuclear transmutationCompared with: Changing neutron count alone changes an isotope, not the element’s identity.

• GeochemistryRelated: Isotope differences underpin geochemical tracers and radiometric age measurements.

• Helium-4Narrower topic: Helium-4 differs from other helium isotopes by its neutron count.

• Kinetic isotope effectNarrower topic: An isotope substitution changes nuclear mass while preserving the element’s chemical identity.

• AllotropyCompared with: Isotopes differ in nuclear composition, whereas allotropes differ in structure.

• Mass numberRelated: Isotopes share an atomic number but differ in mass number.

• NuclideRelated: The isotope concept clarified that one element can contain distinct nuclear species.

• Periodic lawRelated: Isotopes differ in mass but occupy one position because periodic order follows proton number.

• Carbon-12Narrower topic: Carbon-12 is one isotope among several forms of carbon.

• AtomCompared with: Isotopes preserve proton-defined identity while varying in nuclear mass.

• Atomic theoryRelated: Isotopes show that atoms of one element can vary in mass while retaining identity.

• DeuteriumNarrower topic: Deuterium is hydrogen’s isotope with one neutron in its nucleus.

• Enrichment of uraniumNarrower topic: Enrichment changes the relative abundance of uranium isotopes, not the element itself.

• Nuclear drip lineRelated: Moving across isotopes changes neutron number and can approach the neutron drip line.

• Nuclear spinRelated: Isotopes of the same element can have different nuclear spins because their nucleon counts differ.

• Carbon-14Narrower topic: Carbon-14 is one isotope within the family of carbon atoms.

• Decay chainCompared with: Isotopes name nuclides sharing an element; a chain instead describes transformations between nuclides.

• Isotope fractionationNarrower topic: Fractionation changes the relative abundance of an element’s isotopes.

• James ChadwickRelated: Neutrons explained how atoms of one element could have different masses.

• Molecular massRelated: Different isotopes give molecules with the same formula different masses.

• Transuranium elementRelated: Each transuranium element can have isotopes with different masses and decay rates.

• TritiumNarrower topic: Tritium is hydrogen’s mass-number-three isotope.