1. Today we will… Review last night’s homework Take a daily Quiz Continue learning about ionic compounds.

2. Homework: Questions 3, 4, 5, and 6 on page 214

3. Homework 3.What family of elements is relatively unreactive, and why?

4. Homework 3.What family of elements is relatively unreactive, and why? The noble gasses, group 18, because they have completely full or empty shells and their charges are neutral.

5. Homework 4.Describe the formation of both positive and negative ions.

6. Homework 4.Describe the formation of both positive and negative ions. Positive ions form when atoms lose electrons. Negative ions form when atoms gain electrons. (An electron has a negative charge.)

7. Homework 5.Predict the change that must occur in the electron configuration if each of the following atoms is to achieve a noble gas configuration.

8. Homework 5.a. nitrogen

9. Homework 5.a. nitrogen N

10. Homework 5.a. nitrogen N

11. Homework 5.a. nitrogen must add 3 electrons N

12. Homework 5.b. sulfur S

13. Homework 5.b. sulfur S

14. Homework 5.b. sulfur S

15. Homework 5.b. sulfur must add 2 electrons S

16. Homework 5.c. barium Ba

17. Homework 5.c. barium Ba

18. Homework 5.c. barium Ba

19. Homework 5.c. barium must lose 2 electrons Ba

20. Homework 5.d. lithium Li

21. Homework 5.d. lithium Li

22. Homework 5.d. lithium Li

23. Homework 5.d. lithium must lose 1 electron Li

24. Homework 6.Draw models to represent the formation of the positive calcium ion and the negative bromide ion.

25. Homework Ca Br

26. Homework Ca Br

27. Homework Ca Br +1

28. Homework Ca Br +2

29. What happens to the extra electron? Ca Br +2

30. Br Ca Br +2 What happens to the extra electron?

31. What happens to these ions? Br Ca Br +2

32. What happens to these ions? CaBr 2

33. Daily Quiz

34. 1.Of the following elements, which is the least reactive? A. Lithium (Li) B.Boron (B) C.Carbon (C) D.Oxygen (O) E.Neon (Ne)

35. Daily Quiz 2.This dot diagram could represent which of the following elements? A. Lithium (Li) B.Boron (B) C.Carbon (C) D.Oxygen (O) E.Neon (Ne) X

36. Daily Quiz 3.When oxygen ionizes, what will be its charge? A. +3 B.+2 C.neutral D.-2 E.-3

37. Daily Quiz 4.Oxygen could form an ionic bond with which of the following elements? A. Lithium (Li) B.Carbon (C) C.Nitrogen (N) D.Fluorine (F) E.Neon (Ne).

38. Daily Quiz 1.Of the following elements, which is the least reactive? A. Lithium (Li) B.Boron (B) C.Carbon (C) D.Oxygen (O) E.Neon (Ne)

39. Daily Quiz 1.Of the following elements, which is the least reactive? A. Lithium (Li) B.Boron (B) C.Carbon (C) D.Oxygen (O) E.Neon (Ne)

40. Daily Quiz 2.This dot diagram could represent which of the following elements? A. Lithium (Li) B.Boron (B) C.Carbon (C) D.Oxygen (O) E.Neon (Ne) X

41. Daily Quiz 2.This dot diagram could represent which of the following elements? A. Lithium (Li) B.Boron (B) C.Carbon (C) D.Oxygen (O) E.Neon (Ne) X

42. Daily Quiz 3.When oxygen ionizes, what will be its charge? A. +3 B.+2 C.neutral D.-2 E.-3

43. Daily Quiz 3.When oxygen ionizes, what will be its charge? A. +3 B.+2 C.neutral D.-2 E.-3

44. Daily Quiz 4.Oxygen could form an ionic bond with which of the following elements? A. Lithium (Li) B.Carbon (C) C.Nitrogen (N) D.Fluorine (F) E.Neon (Ne)

45. Daily Quiz 4.Oxygen could form an ionic bond with which of the following elements? A. Lithium (Li) B.Carbon (C) C.Nitrogen (N) D.Fluorine (F) E.Neon (Ne).

46. Ionic Compounds Form Crystals

53. VocabularyVocabulary

54. cationpositively charged ion anionnegatively charged ion

55. cationpositively charged ion anionnegatively charged ion Cats have a positive impact on your life.

56. cationpositively charged ion anionnegatively charged ion Ants have a negative impact on your life.

57. formula unitthe ratio of elements in an ionic compound

58. Technically, this is one molecule of salt.

59. formula unitthe ratio of elements in an ionic compound Technically, this is one molecule of salt. It has the formula: Na 95238507751895434357094 Cl 95238507751895434357094

60. formula unitthe ratio of elements in an ionic compound Technically, this is one molecule of salt. It has the formula: Na 95238507751895434357094 Cl 95238507751895434357094 But we will just call it NaCl.

61. oxidation number oxidation state charge These all mean the same thing.

62. Determining Charge

63. How do you know how many electrons an atom will want to take or give away?

64. Determining Charge

65. Elements in group 1 want to give away 1 electron.

66. Determining Charge Elements in group 1 want to give away 1 electron.

67. Determining Charge Elements in group 2 want to give away 2 electrons.

68. Determining Charge Elements in group 17 want to take 1 electron.

69. Determining Charge Elements in group 16 want to take 2 electrons.

70. Determining Charge Elements in group 15 want to take 3 electrons.

71. Determining Charge Transition elements and metaloids can also form ions, but it’s complicated.

72. Determining Charge These one you would need to look up to see their charge.

73. Determining Charge Some elements can have more than one charge. Iron can be Fe +2 or Fe +3.

74. You try some! Write the formula for a compound of SODIUM and CHLORIDE.

75. You try some! Write the formula for a compound of SODIUM and CHLORIDE. NaCl

76. You try some! Write the formula for a compound of LITHIUM and BROMIDE.

77. You try some! Write the formula for a compound of LITHIUM and BROMIDE. LiBr

78. You try some! Write the formula for a compound of FLUORIDE and CESIUM.

79. You try some! Write the formula for a compound of FLUORIDE and CESIUM. CsF

80. What if the charges don’t balance?

81. What would be the formula for BARIUM NITRIDE? Ba N

82. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 1. Find the charges. Ba N

83. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 1. Find the charges. Ba +2 N -3

84. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 2. Find the least common multiple. Ba +2 N -3

85. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 2. Find the least common multiple. Ba +2 N -3 2 x 3 = 6 Six electrons were transferred.

86. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 2. Find the least common multiple. Ba +2 N -3 It takes 3 bariums to provide 6 electrons.

87. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 2. Find the least common multiple. Ba +2 N -3 It takes 2 nitrides to accept 6 electrons.

88. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 2. Find the least common multiple. Ba 3 N 2

89. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 3. The overall charge should be zero. Ba 3 N 2

90. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 3. The overall charge should be zero. Ba 3 N 2 Check your work.

91. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? 3. The overall charge should be zero. Ba 3 N 2 Check your work. 3(+2) + 2(-3) = 0

92. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? The quick way: Ba +2 N -3

93. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? The quick way: Ba +2 N -3 Swap the numbers

94. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? The quick way: Ba 3 N 2 Swap the numbers

95. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? The quick way: Ba 3 N 2 Swap the numbers

96. What if the charges don’t balance? What would be the formula for BARIUM NITRIDE? The quick way: Ba 3 N 2 Swap the numbers

97. You try some! Practice problems 7-11 on page 217