The Atomic Mass of an Atom is the Number Of

Question

The atomic mass of an atom is the number of
A) protons
B) neutrons
C) electrons
D) both A and B

Accepted Answer

The atomic mass of an atom is the sum of the number of protons and neutrons present in the nucleus of an atom. Therefore, both A (protons) and B (neutrons) should be considered to determine the atomic mass. Electrons, which are present in the atomic shells, do not significantly contribute to the atomic mass of an atom.