1. Electrons Pictured Lesson 17 and Lesson 18

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10. http://www.geo.arizona.edu/xtal/geos306/s-orbitals.gif

12. http://cnx.org/content/m15057/latest/ds.GIF

13. http://www.angelfire.com/falcon2/dirgni/f.gif

15. The Rules of Electron Configuration  3 RULES of electron configuration  ___________  ____________  ___________

17. Practicing Aufbau  H  He  Be  Ne

19. Practicing Pauli  H  He  Be  Ne

21. Practicing Hund  H  He  Be  Ne

22. Sample Problem  The electron configuration of B is ______________  How many electrons are present? ____  What is Boron’s atomic number? ____  Write the orbital notation:

23. Practice  The electron configuration of N is ______________  How many electrons are present? ____  What is Nitrogen’s atomic number? ____  Write the orbital notation:

24. Practice  The electron configuration of F is ______________  How many electrons are present? ____  What is Flourine’s atomic number? ____  Write the orbital notation

25. 1S 2 ELECTRON CONFIGURATIONENERGY LEVEL DIAGRAM

27. Periodic Table as Road Map http://www.mpcfaculty.net/mark_bishop/periodic_table_blocks_alone.jpg

28. Electron Configuration Example H → He → Li → F →

29. Electron Configuration Practice  H →  Be →  C →  Ne →

31. The Rules: Noble Gases  Short hand approach to writing electron configurations:  The RULES  1. Locate the given ________  2. Find the ______ gas that comes right before the element in question  Noble gases are in group ____  3. Write the symbol for that noble gas in ________  4. Write the remaining ___________ configuration

32. Noble Gas Configuration Example  Rubidium  1. Find the given element: Atomic # ____  2. _______  3. [_____]  4. [_____]____

33. Noble Gas Configuration Practice  Sulfur  Chlorine  Argon  Potassium  Calcium

35. Core vs. Valence Electrons  Core electrons __ _____participate in chemical reactions.  Valence electrons ____ participate in chemical reactions  They are important because they are the electrons that ______, ____ or _______in chemical reactions

36. n