Variants of a given chemical element that differ in neutron number.

Entity["Isotope",name] or

represents an entity of type "Isotope".

[prop]

gives the value of a specified property.

[{propi,}]

gives the value of a list of properties.

EntityClass["Isotope",{propispeci,}]

represents a class of entities with values of propi defined by speci.

Sample Entities

Sample Entity Classes

Properties

  • AtomicMassatomic mass
    AtomicNumberatomic number
    BindingEnergybinding energy per nucleon
    BiologicalHalfLifebiological halflife
    BiologicalLifetimebiological lifetime
    BranchingRatiosbranching ratios
    CriticalDiametercritical diameter
    CriticalMasscritical mass
    CriticalOrganscritical organs
    DaughterNuclidesdaughter nuclides
    DecayConstantdecay constant
    DecayEnergiesQ-value
    DecayModesdecay modes
    DecayModeSymbolsdecay modes
    DecayProductsdecay products
    DiagnosticApplicationsdiagnostic applications
    DiagnosticApplicationsToDiseasesdiagnostic applications to diseases
    EffectiveHalfLifeeffective halflife
    EffectiveLifetimeeffective lifetime
    ExcitedStateEnergiesE
 level
    ExcitedStateHalfLiveshalf-life tau
 1/2
    ExcitedStateLifetimesexcited state lifetimes
    ExcitedStateParitiesexcited state parities
    ExcitedStateSpinsexcited state spins
    ExcitedStateWidthswidth Δ
    ExternalExposureexternal exposure advisory
    FinalDecayProductsfinal decay products
    FullSymbolfull symbol
    HalfLifehalflife
    HalfValueLayerhalfvalue layer
    IsotopeAbundanceisotope abundance
    Lifetimemean lifetime
    MagneticMomentmagnetic dipole moment
    MassDefectmass defect
    MassExcessmass excess
    MassNumbermass number
    MedicalApplicationsdiagnostic applications
    Membershipsmemberships
    MolarMassmolar mass
    MolarRadioactivitymolar radioactivity
    Namename
    NeutronNumberneutron number
    Parityparity
    QuadrupoleMomentelectric quadrupole moment
    QuantumStatisticstype of particle
    SpecificRadioactivityspecific activity
    Spinspin
    SpinParityspin parity Jπ
    Stablestable
    Symbolbrief symbol
    TenthValueLayertenthvalue layer
    Widthwidth

Details

  • "Isotope" entities include all isotopes of all chemical elements.
  • "Isotope" entity classes include groupings of isotopes by different properties, e.g. isotopes of the same chemical element, isotopes with the same primary decay mode and isotopes with the same atomic number.
  • Some properties are available for the "Isotope" entity type as a whole and can be given using the form EntityValue["Isotope",property]. Such properties include:
  • "Properties"the list of available properties
    "PropertyCanonicalNames"the standard names of available properties
    "SampleEntities"a sample list of available entities (typically of length 10)
    "SampleEntityClasses"a sample list of available entity classes (typically of length 10)
    "EntityCount"number of entities available
    "Entities"the list of available entities
    "EntityCanonicalNames"the standard names of available entities
    "EntityClasses"the list of available entity classes
    "EntityClassCanonicalNames"the standard names of available entity classes
    "PropertyClasses"the list of available property classes
    "PropertyClassCanonicalNames"the standard names of available property classes
    "PropertyCount"number of properties available
  • The following annotations can be used in the third argument of EntityValue["Isotope",property,annotation]:
  • "Source"source information for the property
    "Date"the date associated with the entity-property value (if any)
    "EntityAssociation"an association of entities and entity-property values
    "PropertyAssociation"an association of properties and entity-property values
    "EntityPropertyAssociation"an association in which the specified entities are keys, and values are a nested association of properties and entity-property values
    "PropertyEntityAssociation"an association in which the specified properties are keys, and values are a nested association of entities and entity-property values
    "Dataset"a dataset in which the specified entities are keys, and values are an association of property names and entity-property values
  • The following annotations can be used in the second argument of EntityValue[property,annotation]:
  • "Qualifiers"the list of possible qualifiers for the property
    "QualifierValues"the list of possible values that can be given to each qualifier
    "DefaultQualifierValues"the list of default values for the property's qualifiers
    "Description"a brief textual description of the property
    "Definition"a detailed textual definition of the property
    "PhysicalQuantity"the physical quantity associated with the entity-property value
    "Unit"the unit associated with the entity-property value
  • A qualifier value of Automatic indicates that an applicable format of values can be used; e.g. for the "Date" qualifier, this includes a proper date or date span.

Examples

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Basic Examples  (4)

Use for entity discovery:

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Find a property value for an entity:

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Retrieve a dataset of all available properties for an entity:

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Find the isotopes of uranium with the longest half-life:

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Neat Examples  (1)