1. Chapter 7 “Ionic and Metallic Bonding”

2. Section 7.2 Ionic Bonds and Ionic Compounds
OBJECTIVES:
I can explain the electrical charge of an ionic compound.
I can predict the formula of an ionic compound.
I can describe three properties of ionic compounds.

3. Ionic Bonding: Key Ideas
Anions and cations are held together by _________________ charges (+ and -)
Simplest ratio of elements in an ionic compound is called the formula unit
NaCl has a __________ ratio
MgCl2 has a __________ ratio
The bond is formed through the ___________ of electrons (lose and gain)
Electrons are transferred to achieve ________________________ configuration

4. Ionic Compounds: Key Ideas
Also called _____________________
Consist of a _____________ that is attracted to an ______________
Another way to think about it: a metal (forms a ___________) combining with a nonmetal (forms an ___________)

5. Ionic Bonding: How does it work?
Do Lewis dot diagrams
How will electrons be transferred to make each atom “happy”? Na Cl
The metal (___________) will _______________ its ________ electron from the outer level
The nonmetal (___________) needs to _______ ______ more electron to fill its outer level

6. Ionic Bonding: How does it work?Na Cl
Remember that NO DOTS are now shown for the ___________________!
What charge does the compound have?

7. Ionic Bonding
Ca3P2
This is a chemical formula, which shows the __________ and ______________ of atoms in the smallest representative particle of the substance
What is the formula unit for calcium phosphide?

8. Three Properties of Ionic Compounds
Crystalline solids - a regular repeating arrangement of ions in the solid
∙Ions are ___________________ attracted to each other
∙Repulsions are minimized
∙Structure is stable
______ melting points

9. Video
Ionic compounds can conduct an electric current when melted or dissolved…why?
Conducting electricity means allowing charges to __________________
In a solid, the ions are locked in place
Ionic solids are _________________
When melted or dissolved, the ions can move around

10. Remember, the properties of compounds are different than the properties of the individual elements!
Sodium:
Chlorine:
Sodium chloride (NaCl):