2. Ionic Bonds
Chemistry
Mrs. Meemari

3. Part A:
Ions
Lewis Dot Structure
Stable Octet (or Duet)

4. The Periodic Table and Atomic Radius

5. Valence Electrons
Valence electrons are the electrons in the highest occupied energy level of the atom.
Valence electrons are the only electrons generally involved in bond formation.

6. Na , 11 e

7. Na + , 10e

8. A Positive Ion (Cation):
An atom that has lost one or more electrons.
+ charge

9. Electron Dot Structure or Lewis Dot Diagram
A notation showing the valence electrons surrounding the atomic symbol.

10. Elements within the same group have the same electron-dot structure.

11. A Negative Ion (Anion) An atom that has gained one or more electrons.
Negatively (-) charged.

12. Chlorine Atom  Chlorine Ion

13. Check your Neighbor
When Na, (Z= 11) loses its valence electron, what element does its electron configuration look like?
Neon
Potassium
Beryllium
Sodium
C. discover the property called inertia.

14. Check your Neighbor
When Na, (Z= 11) loses its valence electron, what element does its electron configuration look like ?
Neon
Potassium
Beryllium
Sodium
C. discover the property called inertia.

15. A Stable Octet
When the valence shell is full, the atom is stable, less likely to react.
Example: Noble (Inert Gases) Kr

16. Note
Atoms tend to react in a way that would lead them to have a stable octet.