1. (2.1) Definition, Composition, and History of Matter
Unit 2: Matter
(2.1) Definition, Composition, and History of Matter

3. Democritus and his ideas on atoms

5. Democritus’ Atoms

6. Lavoisier discovering elements

7. Some of Lavoisier’s experiments involving chemical reactions

8. Example of a chemical reaction showing how matter (mass) is conserved

10. (2.2) Development of the Atomic Model
Unit 2: Matter
(2.2) Development of the Atomic Model

11. Examples of types of models

12. History of the Atomic Model

13. John Dalton

15. Dalton’s Atoms

16. J. J. Thomson and his Cathode Ray Tube Experiment

18. J. J. Thomson’s Plum Pudding Model

19. Ernest Rutherford

21. Up close view of Rutherford’s gold atoms

23. James Chadwick

24. Chadwick’s proton-neutron model of the atomic nucleus

25. The three isotopes of Hydrogen: each contain a different number of neutrons

26. Niels Bohr

31. Quarks

32. Different combinations of three quarks produce either a proton or a neutron

33. Quarks have fractional positive and negative charges
Quarks have fractional positive and negative charges. Below would be an example of a neutron

34. (2.3) Elements and the Periodic Table of Elements
Unit 2: Matter
(2.3) Elements and the Periodic Table of Elements

35. Dmitri Mendeleev and his periodic table of elements (next slide)

38. Visual Periodic Table

39. Comparing metals and nonmetals

40. Elemental Metals

41. Additional examples of metals

42. Examples of nonmetals

43. Example of a metalloid