Question

the atomic mass is the number of *
protons + electrons
neutrons + electrons
protons + neutrons
protons
neutrons

Explanation:

In atomic structure, atomic mass (more precisely atomic mass number) is the sum of protons and neutrons in the nucleus. Electrons have negligible mass, so they are not included. Protons alone give atomic number, neutrons alone don't sum to atomic mass, and combinations with electrons are incorrect. So the correct option is protons + neutrons.

Answer:

C. protons + neutrons (assuming the options are labeled A to E with C being protons + neutrons as per the options list: A. protons + electrons, B. neutrons + electrons, C. protons + neutrons, D. protons, E. neutrons)