3. Structure of an Atom

4. Nucleus:

5. Nucleus:Proton

6. Nucleus:Proton+

7. Nucleus:Proton+ Neutron

8. Nucleus:Proton+ Neutron No charge

9. Structure of an Atom Nucleus:Proton+ Neutron No charge Outside the Nucleus:

10. Structure of an Atom Nucleus:Proton+ Neutron No charge Outside the Nucleus: Electron

11. Structure of an Atom Nucleus:Proton+ Neutron No charge Outside the Nucleus: Electron -

12. Structure of an Atom

13. Atomic Number -

14. Structure of an Atom Atomic Number - The number of Protons in the nucleus

15. Structure of an Atom

16. Atomic Mass -

17. Structure of an Atom Atomic Mass - The number of Protons plus the number of Neutrons in the nucleus

18. Structure of an Atom

19. Note:

20. Note: On the Periodic Table

21. Structure of an Atom Note: The number of Protons EQUALS the number Electrons in the atom On the Periodic Table

22. Structure of an Atom Note: On the Periodic Table

23. Structure of an Atom Note: ALL Elements on the Periodic Table are NEUTRAL On the Periodic Table

24. Structure of an Atom Note: On the Periodic Table

25. Structure of an Atom Note: The mass of an Element may change, but the Protons DO NOT! On the Periodic Table

26. Structure of an Atom

27. Question:

28. Question: If the Protons stay the same, what is different to make the Mass change?

29. Structure of an Atom Answer:

30. Answer: Neutrons

32. Role of Electrons

33. Tiny Particles, Big Spaces

34. Role of Electrons Tiny Particles, Big Spaces Valence Electrons:

35. Role of Electrons Tiny Particles, Big Spaces Valence Electrons: Electrons farthest away from the Nucleus

36. Role of Electrons Tiny Particles, Big Spaces Valence Electrons: Involved in bonding

37. # of Valence Electrons

38. Models of Atoms

39. Dalton Model Models of Atoms

40. Dalton Model Models of Atoms John Dalton

41. Dalton Model Models of Atoms John Dalton Great Britain

42. Dalton Model Models of Atoms John Dalton Great Britain 1808

43. Dalton Model 1808 Models of Atoms

44. Dalton Model Each Element is made of small atoms. Models of Atoms 1808

45. Dalton Model Each Element is made of small atoms. Tiny, solid balls 1808

46. Models of Atoms

47. Thomson Model

48. Models of Atoms Thomson Model J. J. Thomson

49. Models of Atoms Thomson Model J. J. Thomson Great Britain

50. Models of Atoms Thomson Model J. J. Thomson Great Britain 1897

51. Models of Atoms Thomson Model 1897

52. Models of Atoms Thomson Model Plum Pudding - 1897

53. Models of Atoms Thomson Model Plum Pudding - positively charge sphere with electrons inside 1897

55. Models of Atoms

56. Nagaoka Model

57. Models of Atoms Nagaoka Model Hantaro Nagaoka

58. Models of Atoms Nagaoka Model Hantaro Nagaoka Japan

59. Models of Atoms Nagaoka Model Hantaro Nagaoka Japan 1904

60. Models of Atoms Nagaoka Model 1904

61. Models of Atoms Nagaoka Model Large Sphere in center with positive charge, 1904

62. Models of Atoms Nagaoka Model Large Sphere in center with positive charge, electrons outside 1904

63. Models of Atoms

64. Rutherford Model

65. Models of Atoms Rutherford Model Ernest Rutherford

66. Models of Atoms Rutherford Model Ernest Rutherford Great Britain

67. Models of Atoms Rutherford Model Ernest Rutherford Great Britain 1911

68. Models of Atoms Rutherford Model 1911

69. Models of Atoms Rutherford Model Atom is mostly Empty Space 1911

70. Models of Atoms Rutherford Model Atom is mostly Empty Space Electrons orbit randomly around the nucleus 1911

71. Gold Foil Experiment

74. Models of Atoms

75. Bohr Model

76. Models of Atoms Bohr Model Niels Bohr

77. Models of Atoms Bohr Model Niels Bohr Denmark

78. Models of Atoms Bohr Model Niels Bohr Denmark 1913

79. Models of Atoms Bohr Model 1913

80. Models of Atoms Bohr Model Electrons are not Random 1913

81. Models of Atoms Bohr Model Electrons are not Random Electrons in specific layers 1913

82. Models of Atoms Bohr Model Electrons are not Random Electrons in specific layers Give energy as they move 1913

83. Models of Atoms

84. Chadwick Model

85. Models of Atoms Chadwick Model James Chadwick

86. Models of Atoms Chadwick Model James Chadwick Great Britain

87. Models of Atoms Chadwick Model James Chadwick Great Britain 1932

88. Models of Atoms Chadwick Model 1932

89. Models of Atoms Chadwick Model Neutron has same mass as the Proton but no electrical charge 1932

91. Models of Atoms

92. Modern Model

93. Models of Atoms Modern Model NOW

94. Models of Atoms Modern Model Electrons form a negatively charged Cloud NOW

95. Models of Atoms Modern Model NOW Electrons form a negatively charged Cloud

96. Models of Atoms Modern Model NOW Electron Cloud Theory

98. I won’t ask if there are more notes!