Preferred Label : mass number;
Detailed label : mass number, A;
IUPAC definition : Total number of heavy particles (protons and neutrons jointly called nucleons) in
the atomic nucleus. Also called nucleon number. Symbol m in mass spectrometry.;
Origin ID : M03726;
See also
Total number of heavy particles (protons and neutrons jointly called nucleons) in
the atomic nucleus. Also called nucleon number. Symbol m in mass spectrometry.