1. Chapter 8 Chemical Bonding
Pages
Section 1

2. Combining Atoms Through Chemical Bonding
Chemical bonding is the joining of atoms to form new substances.
An interaction that holds atoms together is called a chemical bond.

3. Electron Number and Organization
Atomic number = Protons = Electrons
Electrons are organized in energy levels
Most atoms form bonds using only the electrons in the outer energy level
Outer energy level electrons are valence electrons
This chlorine atom has 7 valence electrons

4. Valence Electrons & The Periodic Table
Elements are grouped in vertical columns and have similar properties
Group numbers help you determine the number of valence electrons

5. To Bond or Not To Bond
The number of valence electrons in the outer most energy level of an atom determines if an atom will form bonds.
Atoms tend to bond with other atoms so that they can fill or complete their outer most energy level with eight electrons.
H, He and Li only need two outer electrons to be full.
Noble gases already have a full outer energy level and tend not to bond with other atoms.

6. Let’s Try It!
LAB:
Eggshell Electrons