Isotopic abundance

{
  "id": "MLC-T-CHM-006239",
  "term": "Isotopic abundance",
  "field": "Chemistry",
  "definition": "The proportion of atoms of one isotope among all the atoms of an element in a given mixture, written as a fraction. It applies to any sample, natural or enriched, whereas natural abundance is the terrestrial average value. For example, carbon-12 makes up about 98.9% of natural carbon atoms and carbon-13 about 1.1%.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "isotopes"
  ],
  "references": [
    "PAC, 1982, 54, 1533. 'Glossary of terms used in nuclear analytical chemistry (Provisional)' on page 1535 (https://doi.org/10.1351/pac198254081533)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/isotopic-abundance/"
}