1. Atomic Structure Electron/Proton/Neutron 4 Atom Dudes Guess at What an Atom Looks Like Calculating Electrons, Protons, and Neutrons

2. Subatomic Particles Each atom of an element is composed of 3 different subatomic particles: =Electrons=Protons=Neutrons

3. Electron Smallest of 3 particles Negative Charge -------

4. Proton Positive Charge + # of Protons NEVER CHANGE

5. Neutron No Charge N

6. 4 Atom Dudes John Dalton J.J. Thomson Ernest Rutherford Neils Bohr

7. John Dalton: 4 Atom Concepts 1 st – All elements composed of atoms

8. John Dalton: 4 Atom Concepts 2 nd – Same element have same mass, different element different mass

9. John Dalton: 4 Atom Concepts 3 rd – Compounds contain more than 1 element

10. John Dalton: 4 Atom Concepts 4 th – atoms in compounds always form the same way

11. What Dalton Thought Hard Solid Sphere (Bowling Ball)

12. Dude #2 = J.J. Thomson Discovered the electron and its charge was negative (-)

13. Thomson ‘bend’ experiment

14. Thomson – Atom Looks Like PLUM PUDDING/Chocolate Chip Ice Cream

15. Dude #3 = Ernest Rutherford Discovered the nucleus and it has a positive (+) overall charge

16. Rutherford Experiment – Gold Foil

17. Rutherford – Atom Model

18. Neils Bohr Electrons orbit the nucleus in energy levels (Like planets orbiting sun)

19. Bohr Model

20. Modern Day Atom Model Electron Cloud Model

21. Heisenberg Uncertainty Principal I know where you are But not how fast you are going I know how fast you are going But I don’t know where you are

22. How do we find the number of electrons, proton, and neutrons in an atom? The periodic table tells us all of this!!

23. Ca Calcium 40.08 20

24. Ca Calcium 40.08 20 Top Number = Atomic Number

25. Ca Calcium 40.08 20 Top Number = Protons (+)

26. Ca Calcium 40.08 20 Top Number = Electrons (-)

27. Ca Calcium 40.08 20 Bottom Number = Atomic Mass

28. Ca Calcium 40.08 20 Sum of Protons + Neutrons

29. Simple Math Atomic Mass = Protons + Neutrons Neutrons = Atomic Mass - Protons

30. Keep it simple Round the atomic mass (bottom number) when using it.

31. How many electrons does Calcium Have? Ca Calcium 40.08 20

32. How many protons does Calcium have? Ca Calcium 40.08 20

33. How many neutrons does Calcium have? Ca Calcium 40.08 20

34. 40 – 20 = 20 Neutrons

35. Sum it Up Electrons = Top Number (Atomic Number) Protons = Top Number (Atomic Number) Neutrons = Bottom Number (rounded) – Top Number

36. Sample: Find E/P/N of Carbon (C) Electrons = 6 (top) Protons = 6 (top) Neutrons = 12 – 6 = 6

37. Sample: Find E/P/N of Aluminum (Al) Electrons = Protons = Neutrons =

38. Worksheet