Nucleon number

{
  "id": "MLC-T-CHM-008135",
  "term": "Nucleon number",
  "field": "Chemistry",
  "definition": "The total count of protons and neutrons within an atomic nucleus, also known as the mass number. This integer value represents the approximate relative atomic mass of an isotope. It is typically denoted by the symbol A and is written as a superscript before the element symbol, for example, in 12C.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "mass number"
  ],
  "references": [
    "Green Book, 2nd ed., p. 20 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/nucleon-number/"
}