1. Chem-To-Go Lesson 8 Unit 2 QUANTUM MECHANICAL MODEL You’ll need a periodic table, FOUR different colors, and a pen or pencil to make the labels. Press PAUSE and collect your materials.

2. SIMPLIFIED QUANTUM MECHANICAL MODEL Current model of the atom Extremely organized model describing much electron motion Electron organization Electron cloud Energy levels Sublevels Orbitals Spin Unlock the model in class tomorrow

3.  We’ll learn to describe the motion and organization by using the periodic table. Labeling the table is helpful.  First, we’ll number the rows on the periodic table. PREPARING TO UNDERSTAND

4.  Second, we’ll add the row numbers to a few additional spots.  It can get a little crowded, but you’ll be OK. PREPARING TO UNDERSTAND

5.  Third, we’ll move the Helium block over next to Hydrogen.  NO NEED TO COLOR HELIUM YET…the yellow is just for emphasis. Note that the old Helium block is now gone. PREPARING TO UNDERSTAND He

6.  Next, we’ll shade a few areas on the periodic table.  Choose one color, and lightly shade the area shown below.  We’ll call this area the “s block” of the table. PREPARING TO UNDERSTAND He Choose a couple of elements and spell a word!

7.  Choose a second color, and lightly shade the area shown below.  We’ll call this area the “p block” of the table. PREPARING TO UNDERSTAND He

8.  Choose a third color, and lightly shade the area shown below.  We’ll call this area the “d block” of the table. PREPARING TO UNDERSTAND He

9.  Use the fourth color to lightly shade the area shown below.  We’ll call this area the “f block” of the table. PREPARING TO UNDERSTAND He

10.  aufbau Principle: Each orbital and sublevel on the lower energy levels must be occupied before moving to a higher energy level.  Pauli Exclusion Principle: A maximum of two electrons may occupy an orbital. Paired electrons must spin oppositely.  Hund’s Rule: Single electrons must occupy separate orbitals in a sublevel. No pairing occurs unless no empty orbitals exist in the sublevel. THREE IMPORTANT RULES TO KNOW