9. $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500

10. The vertical columns on the periodic table of elements

11. What are groups?

12. Most reactive of all metals

13. What are Alkali Metals?

14. Arranged elements on a table by increasing atomic mass

15. Who is Mendeleev?

16. Horizontal rows on the periodic table of elements

17. What are periods?

18. Have characteristics of both metals and non- metals

19. What are metalloids?

20. Neutral particles found in the nucleus

21. What is a neutron?

23. What is an electron orbit?

24. Dense, positively charged part of an atom that contains protons and neutrons

25. What is the nucleus?

27. What is an electron?

28. Is equivalent to the number of electrons

29. What are protons?

30. 8 Oxygen 16

31. What is the elements name?

32. Many of these elements are synthetic or man- made

33. What are Rare-Earth elements?

34. Can be calculated by adding the number of protons and neutrons

35. What is the mass number?

36. Has the least mass of all subatomic particles.

37. What is the electron?

38. We are currently studying chapter

39. What is 18?

40. Twentieth-century scientists believe electrons are found in regions called ______________.

41. What are electron clouds?

42. Hypothesized that electrons move around the nucleus in a fixed orbit at specific energy levels

43. Who is Neils Bohr?

44. Stated that matter is made up of small particles that he named atoms

45. Who is Democritus?

46. Stated that matter is made up of small particles that he named atoms

47. Who is Democritus?

48. In 1897 the British scientist J. J. Thomson discovered ________, the negatively charged particles in the atom.

49. What is the electron?

50. First scientist to provide evidence to support the atomic theory

51. Who is John Dalton?

52. One or two letters used to represent an elements name

53. What is chemical symbol?

54. Made of one kind of substance that can not be separated by physical means

55. What is an element?

56. The smallest particle that an element can be divided into and still have the properties of that element

57. What is an atom?

58. The Greek word meaning indivisible

59. What is atomos?

60. Atoms of the same element that have different number of neutrons

61. What are isotopes?

62. An atom of potassium with an atomic number of 19 and an atomic mass of 39.1 has ____ neutrons.

63. What is 20 neutrons?

64. Neutrons and ____ each have a mass of about 1 amu

65. What are protons?

66. Are solids at room temperature except for mercury

67. What are metals?

68. All characteristics are opposite of the metals and half are gases at room temperature

69. What are non-metals?

70. They look shiny and are good conductors of electricity and thermal energy

71. What are metals?

73. Draw mind map of the Periodic table and its components (hint foldable)