isotope
- Guideline or reference source
- ISO11238 IDMP Data elements and structures for the unique identification and exchange of regulated information on substances
- Definition
- variants of a chemical element that differ by molecular mass NOTE Radionuclides or nuclides with a non-natural isotopic ratio are shown in the structural representation with the nuclide number displayed. Natural abundance isotopes are represented by an elemental symbol without a nuclide number. EXAMPLE 13C refers to a carbon atom that has an atomic mass of 13.
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