21. Which of the following about the nuclear force is true?
22. Which of the following is correct for the number of neutrons in the nucleus?
23. Which of the following is the Beta particle?
24. Which of the following is the Beta-particle?
25. Which of the following particles has the smallest mass?
26. Which of the following statements about the mass of an atom is true?
27. Which type of radiation is stopped by a sheet of paper?
28. Why are nuclear energy levels more complex than electron energy levels?
29. Why do heavier nuclei have a greater ratio of neutrons to protons than lighter nuclei?
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