1. How Atoms Combine Part 2

2. How and Why Ionic Compounds Occur
In ionic compounds atoms give away electrons to get their 8 electrons.
Metals give their electrons to the non-metals
Metals end up with a positive charge
Non-Metals end up with a negative charge
Because the ions are charged they stick together in what is called a crystal lattice structure.

3. Crystal Lattice

4. Naming Ionic Compounds
Similar to covalent compounds but NEVER use prefixes (mono-, di-, etc)
Name the metal first
Change the ending of the non-metal to “ide”
Example: NaCl = sodium chloride

5. Examples Provide names for the following compounds: CaCl2
calcium chloride
SrO
strontium oxide
Al2O3
aluminum oxide

6. Writing Formulas Mg2+ Cl1- MgCl2
Using the charges from the periodic table you use the “criss-cross” rules
Example: write the formula for the cmpd formed between magnesium bromide
Write the formulas for the two elements
Write the charges as superscripts
“Criss-cross’’ them to make subscripts
Mg2+ Cl1-
MgCl2

7. Today’s Tasks
Ionic Compounds Worksheet