1. Chemistry Do Now
Directions: Take out a sheet of notebook (Do Now sheet) and set it up as instructed. Answer the following question. (5 minutes).
What period is the element carbon on?
How many electron shells should you draw to create a Bohr model for carbon?
How many electrons does carbon have?
Draw the Bohr model for carbon.

2. Chemistry Do Now
What period is the element carbon on? 2nd period
How many electron shells should you draw to create a Bohr model for carbon? 2 electron shells
How many electrons does carbon have? 6 electrons
Draw the Bohr model for carbon.

3. Homework
Draw the Bohr model, Lewis dot diagram and Electron configurations for the following elements: potassium, aluminum, silicon, helium, beryllium.

4. Engage
Students will brainstorm on scratch paper/Post-it notes what they think chemists do to identify elements in a sample.

5. Explore Students will watch “The Bohr Atom”
Source: =GhAn8xZQ-d8
Students watch the video and respond to corresponding video questions.

6. Lewis Dot Diagram
Lewis structures, also known as Lewis dot diagrams, are diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.
The total number of electrons represented in a Lewis structure is equal to the sum of the numbers of valence electrons on each individual atom. Non-valence electrons are not represented in Lewis structures.

8. Electron Configuration
Electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
There are 4 orbitals: s, p, d, & f

9. Here is the correct order for electron configurations
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p 6f 7d 7f
s orbitals hold up to 2 electrons
p orbitals hold up to 6 electrons
d orbitals hold up to 10 electrons
f orbitals hold up to 14 electrons

10. Example: What is the electron configuration for carbon?
Step 1: Determine how many electrons carbon has.
Carbon has the atomic number of 6 which means it has 6 electrons.
Now fill the electron orbitals in the correct order I just gave to you.
Carbon’s electron configuration 1s2 2s2 2p2

11. Explain
Students will learn how to represent the valence electrons of elements using the Lewis dot diagram and electron configuration.
Sodium
Nitrogen
Oxygen
Chlorine
Sulfur
Calcium
Fluorine

12. Extend/Evaluation Exit Ticket:
Explain how to draw a Lewis dot diagram and electron configuration for each element:
Magnesium
Boron
Phosphorus