1. Nuclear Fission

3. A large (heavy) nucleus

4. Nuclear Fission A large (heavy) nucleus breaks into two smaller nuclei (of intermediate size)

5. Nuclear Fission A large (heavy) nucleus breaks into two smaller nuclei (of intermediate size) and gives off one or more neutrons.

6. Nuclear Fission A large (heavy) nucleus breaks into two smaller nuclei (of intermediate size) and gives off one or more neutrons. This process also releases a large amount of energy.

7. The parent nucleus most commonly used for nuclear fission is Uranium–235

8. 92 protons (235-92) = 143 neutrons

9. The parent nucleus most commonly used for nuclear fission is Uranium–235 92 protons (235-92) = 143 neutrons

10. The parent nucleus most commonly used for nuclear fission is Uranium–235 92 protons (235-92) = 143 neutrons

11. neutron

13. Unstable

16. Krypton–92

17. Barium–141

18. n n n Neutron

19. n n n

23. unstable

28. heat gamma rays

32. Slow neutron

33. Fast neutrons

34. Total charge on Left = 92

35. Total charge on right = 56 + 36 + 3(0) = 92

36. Total mass on left = 235 +1 = 236

37. Total mass on right = 141 + 92 + 3(1) = 236 Total mass on left = 235 +1 = 236

38. Many other fission reactions are possible for uranium–235

39. Many of these fission products are highly radioactive and undergo beta and gamma decay. Many other fission reactions are possible for uranium–235

40. Many of these fission products are highly radioactive and undergo beta and gamma decay. Three particularly dangerous products are: Many other fission reactions are possible for uranium–235

41. Many of these fission products are highly radioactive and undergo beta and gamma decay. Three particularly dangerous products are:  Cesium–137 ( )  Strontium–90 ( )  Iodine–131 ( ) Many other fission reactions are possible for uranium–235

42. Many of these fission products are highly radioactive and undergo beta and gamma decay. Three particularly dangerous products are:  Cesium–137 ( )  Strontium–90 ( )  Iodine–131 ( ) Many other fission reactions are possible for uranium–235

43. Many of these fission products are highly radioactive and undergo beta and gamma decay. Three particularly dangerous products are:  Cesium–137 ( )  Strontium–90 ( )  Iodine–131 ( ) Many other fission reactions are possible for uranium–235

44. Many of these fission products are highly radioactive and undergo beta and gamma decay. Three particularly dangerous products are:  Cesium–137 ( ) half-life 30 years, enters the body like K.  Strontium–90 ( )  Iodine–131 ( ) Many other fission reactions are possible for uranium–235

45. Many of these fission products are highly radioactive and undergo beta and gamma decay. Three particularly dangerous products are:  Cesium–137 ( ) half-life 30 years, enters the body like K.  Strontium–90 ( ) half-life 30 years, stored in bones like Ca  Iodine–131 ( ) Many other fission reactions are possible for uranium–235

46. Many of these fission products are highly radioactive and undergo beta and gamma decay. Three particularly dangerous products are:  Cesium–137 ( ) half-life 30 years, enters the body like K.  Strontium–90 ( ) half-life 30 years, stored in bones like Ca  Iodine–131 ( ) half-life 8 days, absorbed by thyroid gland. Many other fission reactions are possible for uranium–235

47. Finding a Missing Fission Product

48. ?

49. Total charge on Left = 92

50. Finding a Missing Fission Product Total charge on Left = 92 Total charge on right = 56 + 36 + 3(0) = 92

51. Finding a Missing Fission Product Total charge on Left = 92 Total charge on right = 54 + 36 + 3(0) = 92

52. Finding a Missing Fission Product Total charge on Left = 92 Total charge on right = 54 + 36 + 3(0) = 92

53. Finding a Missing Fission Product Total charge on Left = 92 Total charge on right = 54 + 36 + 3(0) = 92 92-54

54. Finding a Missing Fission Product Total charge on Left = 92 Total charge on right = 54 + 38 + 3(0) = 92 92-54

55. Finding a Missing Fission Product Total charge on Left = 92 Total charge on right = 54 + 38 + 3(0) = 92

56. Finding a Missing Fission Product Total charge on Left = 92 Total charge on right = 54 + 38 + 3(0) = 92

57. Finding a Missing Fission Product

58. Total mass on left = 235 + 1 = 236

59. Finding a Missing Fission Product Total mass on left = 235 + 1 = 236 Total mass on right = 143 + 90 + 3(1) = 236

60. Finding a Missing Fission Product Total mass on left = 235 + 1 = 236 Total mass on right = 143 + 90 + 3(1) = 236

61. Finding a Missing Fission Product Total mass on left = 235 + 1 = 236 Total mass on right = 143 + 90 + 3(1) = 236

62. Finding a Missing Fission Product Total mass on left = 235 + 1 = 236 Total mass on right = 143 + 90 + 3(1) = 236

63. Finding a Missing Fission Product Total mass on left = 235 + 1 = 236 Total mass on right = 143 + 90 + 3(1) = 236

64. Finding a Missing Fission Product Total mass on left = 235 + 1 = 236 Total mass on right = 143 + 90 + 3(1) = 236

65. Finding a Missing Fission Product Total mass on left = 235 + 1 = 236 Total mass on right = 143 + 90 + 3(1) = 236

66. Finding a Missing Fission Product The Missing Fission Product

67. Finding the Number of Neutrons Given Off

70. ?

71. ? Total mass on left = 235 + 1 = 236

72. ? Total mass on right = 137 + 97 + 2(1) = 236

73. ? Total mass on left = 235 + 1 = 236 Total mass on right = 137 + 97 + 2(1) = 236

74. ? Total mass on left = 235 + 1 = 236 Total mass on right = 137 + 97 + 2(1) = 236

75. ? Total mass on left = 235 + 1 = 236 Total mass on right = 137 + 97 + 2(1) = 236 234

76. ? Total mass on left = 235 + 1 = 236 Total mass on right = 137 + 97 + 2(1) = 236

77. ? Total mass on left = 235 + 1 = 236 Total mass on right = 137 + 97 + 2(1) = 236

78. Total mass on left = 235 + 1 = 236 Total mass on right = 137 + 97 + 2(1) = 236

79. Total mass on left = 235 + 1 = 236 Total mass on right = 137 + 97 + 2(1) = 236