1. Electron Configuration
SC3b. Use the orbital configuration of neutral atoms to EXPLAIN its effect on the atom’s chemical properties.

2. Electron Configuration
The arrangement of electrons in atoms
Each element has a different # of electrons so the electron configuration is distinct for each element.
Electrons tend to make arrangement to obtain the lowest possible energy (Ground State)

3. Orbital Diagram E-Configuration
An occupied orbital is a line _____
One electron is represented by an up arrow, ↑
2 electrons are represented by 2 arrows, ↑↓
Below the line, place the principal quantum
number and the sublevel.

4. Principle Quantum Number
The main energy level of an atom
Equal to the period #
1s__
2s__ 2p__ __ __
3s__ 3p __ __ __ 3d __ __ __ __ __
The principle quantum numbers are 1, 2, and 3.

5. SUBLEVELS
Sublevel
# Orbitals
# Electrons S 1 2 P 3 6 D 5 10 F 7 14

6. Orbital Diagram Practice
Write the orbital diagram for the following elements…
Example 1) Hydrogen
Example 2) Helium
Example 3) Lithium
Example 4) Beryllium
Example 5) Boron
Example 6) Carbon
Example 7) Nitrogen
Example 8) Oxygen
Example 9 Fluorine
Example 10) Neon