KnowraMass numberLinked fromLinked fromThe 18 pages that link to Mass number, each with the reason it gives.All 18Related 13Compared with 5Atomic numberCompared with: Unlike atomic number, mass number varies among isotopes of the same element.Atomic massCompared with: It is a count, not the measured mass of an atom.Relative atomic massCompared with: Unlike relative atomic mass, it describes one nuclide and is not an isotope-weighted mean.Atomic weightCompared with: Unlike atomic weight, a mass number describes one isotope and is an integer.Standard atomic weightCompared with: Mass number is an integer for one nuclide, not an abundance-weighted element value.