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8. What are the 3 particles that make-up the atom? A. protons, neutrons, and isotopes B. positives, negatives, and electrons C. neutrons, isotopes, and electrons D. protons, neutrons, and electrons 9. What is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons? A. 22. B. 11 C. 34 D. 23 10. If Carbon has an atomic mass of 12 and has 6 protons, how many electrons does it have? A. 18 B.6 C. 12 D. 24 11. Cobalt has 27 protons, 32 neutrons, and 27 electrons. What is the atomic number? A.32 B. 27 C. 59 D. 5 12. Among the three subatomic particles, which is the smallest and the lightest? A. proton B. electron C. neutron D. They are all equa 13. An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the A. 15 B. 16 C. 31 D. 47 14. In the atomic structure of an atom, what is located in the nucleus? A. electrons and neutrons B. neutrons and protons C. protons and electrons D. protons, neutrons and electrons AR Use the picture to answer. What is the atomic mass of gold?​