1. We are starting a new unit
Read the following slides and make a set of notes.
Title today’s notes: Lesson 1 Valance Electrons

2. Chemical Bonds & Reactions- + + -

3. Chemical Bond A force of attraction that holds two atoms together
Has a significant effect on chemical and physical properties of compounds
involves the valence electrons
Valence Electrons – the electrons in the outermost energy level of an atom
This Lithium
Atom has one
valence electron

4. Counting Valence Electrons
Carbon
4 valence
electrons
Beryllium
2 valence
electrons
Oxygen
6 valence
electrons

5. Determining the Number of Valence Electrons by Using the Periodic Table
*Atoms of elements have the same number of valence electrons as their group number number in the periodic table.
Group 1 elements (the alkali metals) have 1 valance electron and group 8 elements (noble gases) have 8 valance electrons

6. How Many Valence Electrons?
Hydrogen
Lead
Xenon
Sulfur
Rubidium
1 Valence
Electron
4 Valence
Electrons
8 Valence
Electrons
6 Valence
Electrons
1 Valence
Electron

7. Valance electron practice
You are finished with your notes.
Now go back to the class website and click on the link titled: Assignment 1 Valance electron practice and complete the assignment in your notebook.