1. 3.3 Electron Configuration Objective 4:b and c
Chemistry

2. Essential Questions What is an electron configuration?
What is the Aufbau Principle?
What are the 2 notations and how do you write them?

3. Electron Configuration
Electron configuration is the arrangement of electrons in an atom
The two types of electron configuration is standard configuration and noble gas notation.

4. Electron Configuration (cont)
Recall: orbitals can only hold 2 electrons
Orbitals come in the following sets:
1 of s, 3 of p, 5 of d, and 7 of f
The orbitals listed in order of increasing energy would be s, p, d, and f.

5. Blocks of the Periodic Table
Energy levels are represented by n
n equals the row number on the periodic table

6. Aufbau Principle
Electrons enter the lowest available energy orbital first

7. Example: Nitrogen atomic # 7
Standard notation: 1s2 2s2 2p3
Noble Gas Notation: [He] 2p3

8. Essential Questions What is an electron configuration?
What is the Aufbau Principle?
What are the 2 notations and how do you write them?

9. 3.3 Tracked Assignments
Worksheet