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4-3

4-3. ELECTRON CONFIGURATIONS. Beaker Breaker. An energy level of n=3 can hold how many electrons? The second quantum number ( Angular Momentum Quantum Number, l) for n=2 is_____________ The letter denotation (shapes) for n =2 is?. Hund’s Rule.

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4-3

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  1. 4-3 ELECTRON CONFIGURATIONS

  2. Beaker Breaker • An energy level of n=3 can hold how many electrons? • The second quantum number (Angular Momentum Quantum Number, l) for n=2 is_____________ • The letter denotation (shapes) for n =2 is?

  3. Hund’s Rule • Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and… • All electrons in singly occupied orbitals must have the same spin

  4. Relative Energies of Orbitals

  5. Order of increasing energy for each orbital p. 105 and 110)

  6. Aufbau Principle • An electron occupies the lowest-energy orbital that can receive it

  7. Beaker Breaker • Write the orbital notation of Oxygen (O) • Write the orbital notation of Ti

  8. Noble Gas Notation • What is the noble gas configuration for calcium? • 1s22s22p63s23p64s2 • [Ar]4s2 • What is the noble gas config for S? • 1s22s22p63s23p4 • [Ne]3s2 3p4

  9. Beaker Partner Practice Problems • The electron configuration of fluorine is 1s22s22p5 What is the atomic number of fluorine? How many of its p orbitals are filled? How many unpaired electrons does a fluorine atom contain? • Write the electron configuration, noble gas configuration and orbital notation for: • Na • Al • Cl • P

  10. Beaker Breaker Problem Complete the electron configuration and noble-gas configuration only of chlorine (Cl) Open books to page 110 please

  11. Objective • Describe the electron configurations for the atoms of any element using oribital notation, electron-configuration notation and when appropriate, noble-gas notation.

  12. Beaker Partner Activity • Complete the electron configuration and noble gas configuration only of the following elements • Cadmium (Cd) • Tin (Sn)

  13. Objective • Describe the electron configurations for the atoms of any element using oribital notation, electron-configuration notation and when appropriate, noble-gas notation.

  14. PREDICTED

  15. PreClass: Write the following notations for the element chromium (Z = 24): • Electron configuration • Orbital notation • Noble gas

  16. jbechtel: GO THRU Ca

  17. Beaker BreakerWrite the following notations for the element nickel (Z=28): • Orbital notation • Electron configuration • Noble gas

  18. PreClass: Write the following notations for the element bismuth (Z = 83): • Electron configuration • Orbital notation • Noble gas

  19. Why can the 3rd energy level hold 18 electrons?

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