2. Early Atomic Theory Vocab. Structure of an Atom Atom Discoveries $100 $200 $300 $400 $500 $400 $500 $100 $200 $300 $400 $500Random

3. Democritus

4. W AS A TEACHER, CHEMIST, METEOROLOGIST, & PHYSICIST John Dalton

5. F RENCH T AXMAN WHO GAVE US THE L AW OF THE C ONSERVATIONS OF M ASS Antoine Lavoisier

6. H E DEVELOPED THE L AW OF D EFINITE P ROPORTIONS Joseph Proust

7. N AME ONE OF THE PROBLEMS WITH D ALTON ’ S A TOMIC THEORY Atoms can be divided into particles Atoms can be created and destroyed It doesn’t account for molecules, allotropes, and isotopes

8. Ernest Rutherford

9. J.J. Thomson

10. Eugen Goldstein

11. James Chadwick & Irene Joilet-Curie

12. Robert Millikan

13. Electron

14. Neutron

15. Proton

16. Protons & Neutrons

17. Electron Cloud

18. Atomic Number

19. Mass Number

20. Average Atomic Mass

21. Isotopes

22. I S EQUAL TO ONE - TWELFTH OF THE MASS OF CARBON -12 ATOM Atomic Mass Unit

23. Group

24. Period or Energy Level

25. Louis de Broglie Albert Einstein Max Planck

26. Electromagnetic Spectrum

27. Radio waves, microwaves, infrared, visible ultraviolet, x-rays, gamma rays

31. Leptons, photons, quarks, gravitons, or neutrinos