2. Science 9 Decay Problems #2 35 point total

3. 1. State the number of protons & neutrons in the following: ProtonsNeutrons 56 26 30 12 6 66 Fe C

4. 1. State the number of protons & neutrons in the following: ProtonsNeutrons 197 79 118 90 38 52 Au Sr

5. 1. State the number of protons & neutrons in the following: ProtonsNeutrons 235 92 143 238 92 146 U U

6. 2. Which isotope has more neutrons, U-235 or U-238? U-238

7. 3. How is the nucleus of a carbon-12 atom different from the nucleus of a carbon-14 atom? Carbon-14 has two more neutrons

8. 4. How is the nucleus of a carbon-12 atom the same as the nucleus of a carbon- 14 atom? They both have 6 protons

9. The atomic number of element X is 115. 5. What would be the atomic number if X gave off a beta particle? 116

10. The atomic number of element X is 115. 6. What would be the atomic number if X gave off an alpha particle? 113

11. The atomic number of element X is 115. 7. What would be the atomic number if X only gave off gamma rays? 115

12. The mass number of element X is 260. 8. What would be the mass number if X gave off a beta particle? 260

13. The mass number of element X is 260. 9. What would be the mass number if X gave off an alpha particle? 256

14. The mass number of element X is 260. 10. What would be the mass number if X only gave off gamma rays? 260

15. 11. What is the mass number of Polonium-218?

16. 218

17. 12. What is the atomic number of Polonium-218?

18. 84

19. 13. What is the correct symbol for Polonium-218?

20. 218 84 Po

21. Polonium-218 undergoes alpha decay.

22. 14. What is the mass number of the new isotope?

23. 214

24. 15. What is the atomic number of the new isotope?

25. 82

26. 16. What is the correct symbol for the new isotope?

27. 214 82 Pb

28. 17. What is the name of the new isotope?

29. Lead-214

30. 18. What is the mass number of Carbon-14?

31. 14

32. 19. What is the atomic number of Carbon-14?

33. 6

34. 20. What is the correct symbol for Carbon-14?

35. 14 6 C

36. Carbon-14 undergoes beta decay.

37. 21. What is the mass number of the new isotope?

38. 14

39. 22. What is the atomic number of the new isotope?

40. 7

41. 23. What is the correct symbol for the new isotope?

42. 14 7 N

43. 24. What is the name of the new isotope?

44. Nitrogen-14