Question

atomic mass equals the combined number of
protons and electrons
electrons and neutrons
protons and neutrons

Explanation:

Atomic mass (more precisely, atomic mass number) is defined as the sum of the number of protons and neutrons in an atom's nucleus. Electrons have negligible mass compared to protons and neutrons, so they are not included in the calculation of atomic mass. So the correct option is the one with Protons and Neutrons.

Answer:

Protons and Neutrons (the orange - colored option with text "Protons and Neutrons")