Answer:
2) total number of protons
Helium has an atomic number of one, and has only one proton in its nucleus.
Oxygen has an atomic number of 8 and an atomic mass of 16. From this we know that the atomic number measures the number of protons, and the atomic mass is the overal sum of protons and neutrons.
Answer:
2.) The total number of protons
Explanation:
The definition of atomic number is the total number of protons in the nucleus of an atom.
Hope I helped
