Answer:
1. Protons - 20. Neutrons - 22. Electrons - 20. Atomic Number - 20. Mass Number - 42.
2. Protons - 28. Neutrons - 26. Electrons - 28. Atomic Number - 28. Mass Number - 54.
3. Isotope - Al-28. Electrons - 13. Atomic Number - 13. Mass Number - 28
4. Isotope - S-31. Protons - 16. Neutrons - 15. Electrons - 16.
5. Isotope - F-18. Protons - 9. Neutrons - 9. Electrons - 9.
6. Isotope - Ge-61. Protons - 32. Neutrons - 29. Electrons - 32. Atomic - 32.
7. Protons - 3. Neutrons - 4. Electrons - 3. Atomic Number - 3. Mass Number - 7
8. Protons - 12. Neutrons - 13. Electrons - 12. Atomic Number - 12. Mass Number - 25
Explanation: Some tips for this: protons are the same as the atomic number, and determine which element it is. Electrons in this case are all the same number as the protons. Neutrons come from the mass number, which is the number of protons plus neutrons. If you only have mass number and protons, subtract the protons from mass number to get the neutrons. If you only have mass number and neutrons, subtract the neutrons from the mass number to get the protons.