Answer;
B) The average total mass of its neutrons, protons, and electrons
Explanation;
-The atomic mass is approximately equivalent to the number of protons and neutrons in the atom.
-The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
