1. 10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt 10 pt 15 pt 20 pt 25 pt 5 pt History of the Atom Subatomic Particles ScientistsNumbersElectrons

2. Last of the three subatomic particles to be discovered.

3. The neutron

4. Series of experiments used to discover the nucleus of the atom.

5. The Gold Foil Experiment

6. J. J. Thomson’s model of the atom was known as _________ model.

7. chocolate chip cookie

8. Bohr discovers that the _________ is separated into different energy levels.

9. electron cloud

10. Greek philosopher who first came up with the idea of an “atomos”.

11. Democritus

12. The particle that has a positive charge.

13. The proton

14. The particle not found in the nucleus.

15. The electron

16. The mass of the neutron

17. One (1) A.M.U.

18. Other particle found in the nucleus besides the neutron

19. The proton

20. The particle that has no mass

21. The electron

22. Gold Foil Experiment

23. Ernest Rutherford

24. Discovered the neutron

25. James Chadwick

26. Discovered the electron

27. J. J. Thomson

28. First scientific atomic theory published in 1808.

29. John Dalton

30. Discovered the nucleus

31. Ernest Rutherford

32. Same atomic number different mass number

33. isotopes

34. Number of protons

35. Atomic number

36. Number of neutrons and protons

37. Mass number

38. The mass of the nucleus of an atom of Carbon-14.

39. 14 AMU

40. Atomic number is 80 and the mass number is 200. How many neutrons are in this atom?

41. 120

42. An atom emits light when one of its electrons

43. moves from a higher energy level to a lower energy level

44. Gaining and losing electrons when bonding causes an atom to become charged. A charge atom is called a(n)

45. ion

46. Electron with higher energy are located

47. Farther from the nucleus of the atom

48. The charge on an ion with 10 electrons and 8 protons.

49. -2

50. Subatomic particle that makes up electrical current

51. an electron