1. Properties of Compounds
Chemistry 11
Ms. McGrath

2. Properties of Ionic compounds
Property
state at room temperature
crystalline solid
melting point
high
electrical conductivity as a liquid
yes
solubility in water
most have high solubility
conducts electricity when dissolved in water

3. Properties of Molecular compounds
Property
state at room temperature
gas, liquid, solid
melting point
low
electrical conductivity as a liquid no
solubility in water
most have low solubility
conducts electricity when dissolved in water
not usually

4. Ionic and Molecular Compounds
Ionic compounds contain metals and non-metals.
Molecular compounds contain only non-metals.
The bonds between metals and non-metals differ from the bonds between two or more non-metals.
It is the difference between these types of bonds that give compounds their diverse physical properties.

5. Valence Electrons
Electrons found in the outer most energy level or shell
These are the electrons that participate in bonding

6. Lewis Structures Shows only valence electrons
Valence electrons are represented by dots
The chemical symbol represents the nucleus (with neutrons and protons) and all the full valence shells

7. Lewis Structures
Electrons fill up one energy level before moving into the higher energy levels
Energy levels
1st energy level – maximum 2 electrons
2nd energy level – maximum 8 electrons
3rd energy level – maximum 8 electrons

8. Lewis Structures

9. Lewis Structures
Complete #2 – 4, page 164