Science 9 Decay Problems #3 56 point total Each answer 1 pt. each except for symbols which are 3 pt. each.

1. What is the mass number of Astatine-218?

2. What is the atomic number of Astatine-218? 85

3. What is the correct symbol for Astatine-218? 85

Astatine-218 undergoes alpha decay.

4. What is the mass number of the new isotope? 214

5. What is the atomic number of the new isotope? 83

6. What is the correct symbol for the new isotope? Bi 214 83

7. What is the name of the new isotope? Bismuth-214

8. What is the mass number of Lead-210?

9. What is the atomic number of Lead-210? 82

10. What is the correct symbol for Lead-210? Pb 210 82

Lead-210 undergoes beta decay.

11. What is the mass number of the new isotope? 210

12. What is the atomic number of the new isotope? 83

13. What is the correct symbol for the new isotope? Bi 210 83

14. What is the name of the new isotope? Bismuth-210

15. What is the mass number of Seaborgium-263?

16. What is the atomic number of Seaborgium-263? 106

17. What is the correct symbol for Seaborgium-263? Sg 263 106

Seaborgium-263 undergoes alpha decay.

18. What is the mass number of the new isotope? 259

19. What is the atomic number of the new isotope? 104

20. What is the correct symbol for the new isotope? Rf 259 104

21. What is the name of the new isotope? Rutherfordium-259

22. What is the mass number of Bismuth-210?

23. What is the atomic number of Bismuth-210? 83

24. What is the correct symbol for Bismuth-210? 83

Bismuth-210 undergoes beta decay.

25. What is the mass number of the new isotope? 210

26. What is the atomic number of the new isotope? 84

27. What is the correct symbol for the new isotope? Po 210 84

28. What is the name of the new isotope? Polonium-210

29. What is the mass number of Protactinium-231?

30. What is the atomic number of Protactinium-231? 91

31. What is the correct symbol for Protactinium-231? Pa 231 91

Protactinium-231 undergoes alpha decay.

32. What is the mass number of the new isotope? 227

33. What is the atomic number of the new isotope? 89

34. What is the correct symbol for the new isotope? Ac 227 89

35. What is the name of the new isotope? Actinium-227

36. What is the mass number of Actinium-227?

37. What is the atomic number of Actinium-227? 89

38. What is the correct symbol for Actinium-227? 89

Actinium-227 undergoes beta decay.

39. What is the mass number of the new isotope? 227

40. What is the atomic number of the new isotope? 90

41. What is the correct symbol for the new isotope? 227 90

42. What is the name of the new isotope? Thorium-227

43. What is the mass number of Samarium-149?

44. What is the atomic number of Samarium-149? 62

45. What is the correct symbol for Samarium-149? Sm 149 62

Samarium-149 undergoes alpha decay.

46. What is the mass number of the new isotope? 145

47. What is the atomic number of the new isotope? 60

48. What is the correct symbol for the new isotope? Nd 145 60

49. What is the name of the new isotope? Neodymium-145

50. What is the mass number of Polonium-210?

51. What is the atomic number of Polonium-210? 84

52. What is the correct symbol for Polonium-210? 84

Polonium-210 undergoes beta decay.

53. What is the mass number of the new isotope? 210

54. What is the atomic number of the new isotope? 85

55. What is the correct symbol for the new isotope? 210 85

56. What is the name of the new isotope? Astatine-210