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November 4, 2009

November 4, 2009. EXAM #3 MONDAY, NOVEMBER 9 TH (Chapters 6 and 7) Bring a Periodic Table to class Manners reminder Today: Finish Chapter 7 Orbital filling Periodic Properties. Rules for filling orbitals. Pauli Exclusion Principle No two electrons can have the same 4 quantum numbers

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November 4, 2009

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  1. November 4, 2009 EXAM #3 MONDAY, NOVEMBER 9TH (Chapters 6 and 7) Bring a Periodic Table to class Manners reminder Today: Finish Chapter 7 Orbital filling Periodic Properties

  2. Rules for filling orbitals • Pauli Exclusion Principle No two electrons can have the same 4 quantum numbers An orbital has a maximum of 2 electrons of opposite spin • Aufbau/Build-up Principle Lower energy levels fill before higher energy levels • Hund’s Rule Electrons only pair after all orbitals at an energy level have 1 electron • Madelung’s Rule Orbitals fill in the order of the value of n + l

  3. Madelung’s Rule= Orbital Filling Order

  4. Three Types of Notation

  5. Electron Configurations and the Periodic Table • n value increases as you move down (Li, Na, K) Li Na K

  6. Electron Configurations and the Periodic Table • Periodic Blocks & Hund’s Rule (using the p block) C O Sc N

  7. Electron Configurations and the Periodic Table • Using periodic blocks: everything is filled up to the bloakc you are in; count over to determine “how filled” the final orbital is

  8. Electron Configurations and the Periodic Table

  9. What is the electron configuration for Al? • 1s22s22p63s1 • 1s22s22p63s23p1 • 1s22s22p63s23p2 • 1s22s22p1

  10. Which element has the ground state electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d2? • K • Ca • Ti • Mn • Fe

  11. Which is the correct Noble Gas electron configuration for the element Zinc? • [Ne]3s2 3p6 4s2 3d10 • [Ne] 3s23p6 • [Ar] 3s2 3p6 4s2 3d10 • [Ar] 3d10 4s1 • [Ar]3d104s2

  12. Electron Configurations and the Periodic Table • Chromium and copper are anomalies Cr Cu

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