Johnmarkbolinggo Johnmarkbolinggo Science Answered 11. The three basic subatomic particles are: A. Proton, neutron, and hydrogen C. Proton, neutron, and electron B. Nucleus, proton, and neutron D. Proton, ion, and electron 12. The number of protons within the nucleus of an atom is called its A. Atomic mass C. Atomic number B. Mass number D. Nucleon number 13. Collectively, protons and neutrons are called A. Electrons C. Nucleons B. Ions D. Nucleus 14. Which of the following particles will be attracted to a negatively charged plate? A. Electron C. Both of them B. Proton D. neither of the two