2. 2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 1 pt 2 pt 3 pt 4pt 5 pt 1pt Protons, Neutrons, Electrons Experiments Radioactive Decay Isotopes and Atomic Mass Miscellaneous

3. For an atom that does not have a charge, the # of _____ = the # of ______. For any element, the atomic number is equal to the number of _______.

4. What is protons, electrons, protons

5. Name the # protons, # neutrons, and # electrons for… Hg 182 80

6. 80 protons, 102 neutrons, 80 electrons

7. Name the number of protons, neutrons, and electrons for… Pb 207 82

8. 82 protons, 125 neutrons, 82 electrons

9. What is the element symbol for the element with 47 electrons and 62 neutrons?

10. Ag 109 47

11. Find the element name, number of protons, and number of neutrons for an atom with a mass number of 79 and an atomic number 35.

12. Bromine, 35 protons and 44 neutrons

13. What was the charge on the particles in the following picture? How do you know? Battery - +

14. Negative, because particles come from negative plate and are attracted to positive plate

15. Why were some alpha particles deflected in Rutherford’s experiment?

16. Because the + alpha particles were repelled by the + nucleus of the atom

17. Draw the Plum Pudding model of the atom:

18. Positive Interior   Electron

19. Rutherford performed an experiment using gold foil. He shot alpha particles with a 1. ___________ charge at gold foil atoms. He thought the alpha particles would 2. _______ the foil because the plum pudding model has charges that are 3. _____________

20. 1.Positive 2.Go straight through 3.Evenly distributed

21. Draw a close up of an alpha particle being deflected by an atom.

22. What was happening on an atomic level… +  Positive Center  Alpha beam deflected because positive charges repel

23. Draw the symbol for an alpha particle. Draw the symbol for a beta particle.

24. Alpha:Beta: He e 4 2 0

25. During alpha decay, the atomic number decreases by 1. _____ and the mass number decreases by 2. ______. During beta decay, the atomic number 3. __________.

26. 2 4 increases

27. 1. Balance the equation for the alpha decay of Pa. 2. Balance the equation for the Beta decay of that same element. 231 91

28. Pa  231 89 231 91 Ac 227 91 + He 4 2 U 231 92 e + 0

29. Balance the following nuclear reaction for the alpha decay of uranium: U 238 92 

30. Answer… 1. U  238 90 Th 234 92 + He 4 2

31. Balance the nuclear equation when Fr undergoes beta decay 223 87

32. Answer… Fr  223 88 Ra 223 87 + e 0

33. Isotopes of an element have the same number of _________ but different numbers of __________

34. Protons, Neutrons

35. DAILY DOUBLE! What is the mass number of an atom?

36. # PROTONS + # NEUTRONS

37. Why is the atomic mass on the periodic table a decimal?

38. Because it is the AVERAGE atomic mass of the isotopes for that atom

39. Calculate the average atomic mass of potassium. Potassium is 93.26% potassium-39, and 6.74% potassium-41.

40. 64.0054 amu

41. Mg X has three naturally occurring isotopes: Mg-24, Mg-25, and Mg-26. The abundance is 10.00 % for Mg-25. The abundance is 11.01% for Mg-26. Find the % abundance for Mg-24 and the average atomic mass for Mg.

42. Abundance: 78.99% Mass: 24.32

43. Atoms AtomProtonsNeutronsElectrons 18108 2 9 3999 48118 Which two elements in the table are isotopes?

44. Elements 1 and 4

45. Atoms AtomProtonsNeutronsElectrons 18108 2 9 3999 48118 Which two elements have the same mass?

46. Elements 2 and 4

47. Which type of radioactive decay releases the particle shown:

48. Alpha Decay

49. DAILY DOUBLE! Which is the correct symbol for the atom with 42 protons and 49 neutrons?

51. Identify the missing particle in the equation below. Justify your response.

52. Beta Particle