1. Lon-Capa 6 th HW assignment due Friday, 11/6, 5 pm. It is open now. 5 th Quiz due Sunday, 11/15 by 10 pm. It will open Friday, 11/13 at 5 pm. 1

2. Four Trends to Understand Atomic radius Ionization Energy Energy required to remove an electron from a gaseous atom (or cation). Electron Affinity Energy change associated with the addition of an electron to a gaseous atom or ion. Electronegativity Ability of an atom in a molecule to attract shared electrons to itself. 2

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4. IE vs. Atomic Number 4

5. Successive IEs 5

6. EA vs. Atomic Number 6

7. Clicker Question Consider different “sodium particles” (atom or ions) in separate evacuated containers. Which of the following sodium species is lowest in energy? a)Na b)Na + c)Na 2+ d)Na  e)Na 2  7

8. Clicker Question Consider different “oxygen particles” (atom or ions) in separate evacuated containers. Which of the following oxygen species is lowest in energy? a)O b)O + c)O 2+ d)O  e)O 2  8

9. Clicker Question Consider different “oxygen particles” (atom or ions) in separate evacuated containers. Which of the following oxygen species is second lowest in energy? a)O b)O + c)O 2+ d)O  e)O 2  9

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12. Successive IEs 12

13. Sizes of Ions 13

14. The Structure of Lithium Fluoride (ionic solid) 14

15. Percent Ionic Character 15