1. Bonding

2. Chemical Bonds
These are the attractive forces that hold atoms together in a compound

3. Breaking a bond… Takes energy to overcome the attractive forces
Therefore, breaking bonds is endothermic
Energy + XY X + Y

4. Forming a bond…
When a bond between two atoms is formed, energy is released. The bonded atoms are more stable together than they were alone.
Therefore, forming bonds is exothermic
X + Y XY + energy

5. Lewis Dot Structure (also called electron dot diagrams),
show only the VALENCE e- in an
atom. For bonding, only the valence e- are important.
One dot = e-

6. Lewis Dot Structures
Since an atom can only have a max of 8 valence e-, we will never need more than 8 dots
One dot = e-

7. To show an atoms valence e-
imagine a “box” around the atom’s symbol:
Since Neon has 8 valence e-, it will have 8 dots, 2 on each “side”