2. 4-3 ELECTRON CONFIGURATIONS

3. Beaker Breaker 1.An energy level of n=3 can hold how many electrons? 2.The second quantum number ( Angular Momentum Quantum Number, l) for n=2 is_____________ 3.The letter denotation (shapes) for n =2 is?

4. 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

5. Relative Energies of Orbitals

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

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

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

9. Noble Gas Notation What is the noble gas configuration for calcium? 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 [Ar]4s 2 What is the noble gas config for S? 1s 2 2s 2 2p 6 3s 2 3p 4 [Ne]3s 2 3p 4

10. Beaker Partner Practice Problems The electron configuration of fluorine is 1s 2 2s 2 2p 5 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: 1.Na 2.Al 3.Cl 4.P

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

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

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

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

15. PREDICTED

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

17. ELEMENTORBITAL NOTATION ELECTRON CONFIGURATION NOTATION Cr Mn Cu Zn jbechtel: GO THRU Ca jbechtel: GO THRU Ca

18. Beaker Breaker Write the following notations for the element nickel (Z=28): Orbital notation Electron configuration Noble gas

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

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