Catalyst: Draw the atomic model and Lewis Dot Structure for F -

1. Catalyst: Draw the atomic model and Lewis Dot Structure for F- Thurs, Nov. 6th, 2008

2. Today’s Objective: SWBAT • Describe what bonds are. • Identify and draw atomic models of ionic compounds.

4. Matter Classification Review • How would you describe the following two images using the following terms: atom, molecule, element, and compound.

5. Matter Classification Review • Both of these are molecules and compounds. • Molecule b/c 2+ atoms • Compounds b/c 2 types of elements.

7. Compounds • How are compounds held together? (Brainstorm in pairs) • They are held together by forces called chemical bonds. • These bonds form as a result of valence electrons interacting b/t elements.

9. Valence Review • As the group number on the periodic table increases (as you move to the right), what happens to the number of valence electrons? (Think first!)

10. Valence Review • As group # increases, the # val. e- increases. • Why is this important?

12. Valence Review • Atoms WANT to have 8 electrons in their valence shell. • Which side of the periodic table would be more likely to receive electrons to make this happen?

13. Valence Review • The right side of the periodic table is more likely to receive electrons to make a full shell. • As group # increases, the ability to gain electrons, increases.

15. Valence Review • The left side (metals) want to give away electrons & the right side (non-metals) want to accept electrons.

16. Valence Review • If an atom has few valence electrons, it wants to give them away (it is generous). • If an atom has many valence electrons, it wants to take more (it is greedy).

18. Lewis Dot Review (Left page) • What are the Lewis Dot Structures for Sodium & Chlorine? • Sodium – 1 val. e- • Chlorine – 7 val. e-

19. Lewis Dot Review (Left page) • Which one is more likely to give away electrons? • Sodium (has fewer val. e-) • Which one is more likely to accept electrons? • Chlorine (has more val. e-)

20. Ionic Bonds • What the heck does this have to do with bonds??

21. Ionic Bonds • Ionic bonds occur when electrons in a compound are transferred from one atom to another. • Why? • Atoms that are more likely to give away electrons will transfer electrons to the atom that is more likely to accept electrons.

23. Ionic Bonds • When an ionic bond is formed, atoms gain or lose electrons. • What are atoms that do not have the same number of protons & electrons called? • IONS

24. Steps for Creating Ionic Bonds • 1. Draw the Lewis Dot structure for each atom. • 2. Figure out which atom is more likely to give away electrons. • 3. Figure out which atom is more likely to receive electrons.

26. Steps for Creating Ionic Bonds (Example – Left page) • 1. Draw the Lewis Dot Structures for Sodium & Chlorine. • Sodium (Na): 1 val. e- Chlorine (Cl): 7 val. e- Na Cl

27. Steps for Creating Ionic Bonds (Example – Left page) • 2. Figure out which atom is more likely to give away electrons. • 3. Figure out which atom is more likely to receive electrons. Na Cl

28. Steps for Creating Ionic Bonds • 4. Figure out how many electrons need to be transferred. • 5. Draw an arrow showing transfer of electrons. • 6. Determine and write charges of ions created.

30. Steps for Creating Ionic Bonds (Example – Left page) • 4. Figure out how many electrons need to be transferred. • 1e- to be transferred Cl Na

31. Steps for Creating Ionic Bonds (Example – Left page) • 5. Draw an arrow showing transfer of electrons. Cl Na

32. Steps for Creating Ionic Bonds (Example – Left page) • 6. Determine and write charges of ions formed. + - Cl Na

33. Steps for Creating Ionic Bonds (Example 2 – Left page) • Create an ionic bond between Sodium (Na) and Flourine (F). (Take 3 minutes)

34. Steps for Creating Ionic Bonds (Example 2 – Left page) • 1. Draw Lewis Dot structures. • 2. Figure which atom is more likely to give away electrons. • 3. “…” receive electrons. • 4. Figure # e- to be transferred. • 5. Draw arrow showing e- moving. • 6. Write charges of new ions. F Na

35. Steps for Creating Ionic Bonds (Example 2 – Left page) • 1. Draw Lewis Dot structures. • 2. Figure which atom is more likely to give away electrons. • 3. “…” receive electrons. • 4. Figure # e- to be transferred. • 5. Draw arrow showing e- moving. • 6. Write charges of new ions. F Na

36. Steps for Creating Ionic Bonds (Example 2 – Left page) • 1. Draw Lewis Dot structures. • 2. Figure which atom is more likely to give away electrons. • 3. “…” receive electrons. • 4. Figure # e- to be transferred. • 5. Draw arrow showing e- moving. • 6. Write charges of new ions. F Na

37. Steps for Creating Ionic Bonds (Example 2 – Left page) • 1. Draw Lewis Dot structures. • 2. Figure which atom is more likely to give away electrons. • 3. “…” receive electrons. • 4. Figure # e- to be transferred. (1) • 5. Draw arrow showing e- moving. • 6. Write charges of new ions. F Na

38. Steps for Creating Ionic Bonds (Example 2 – Left page) • 1. Draw Lewis Dot structures. • 2. Figure which atom is more likely to give away electrons. • 3. “…” receive electrons. • 4. Figure # e- to be transferred. (1) • 5. Draw arrow showing e- moving. • 6. Write charges of new ions. F Na

39. Steps for Creating Ionic Bonds (Example 2 – Left page) • 1. Draw Lewis Dot structures. • 2. Figure which atom is more likely to give away electrons. • 3. “…” receive electrons. • 4. Figure # e- to be transferred. (1) • 5. Draw arrow showing e- moving. • 6. Write charges of new ions. + - F Na

40. Sample Problems (on white boards) • Draw the ionic bonds between the following elements: • 1. Potassium & Flourine • 2. Potassium & Chlorine • 3. Hydrogen & Flourine • 4. Chlorine & Hydrogen • 5. Atom “X” with 6 valence electrons & Atom “Y” with 2 valence electrons. • 6. Atom “Aa” with 5 total electrons & Atom “Bb” with 7 total electrons.