1. Topic: Lewis Dot Diagrams for Ionic Compounds
Do Now: Identify ionic compounds
CO2
MgCl2
NH4Cl
NaOH
NH3
CH4
CuSO4 HF

2. Magnesium’s outer shell is now empty
Fluorine’s outer shell is now full

3. Lewis Diagrams for Ionic Compounds
NaCl's Lewis structure:
[Na]+1[ Cl ]-1 • • • • • • • •
Remember: Lewis diagrams show valence electrons!

4. Predicting Ionic Compounds
What is the ionic compound formed from calcium and iodine?
Calcium - metal - 2 valence electrons
- loses both electrons  [Ca]+2
Iodine - nonmetal - 7 valence electrons
- gains 1 electron  [ ‍I ]-1 •• • • • • ••
How many iodine ions do you need to make a neutral compound? 2

5. Lewis Diagram of Calcium Iodide
Ca → Ca
I → I
[Ca]+2[:I:]-1[:I:]-1
Note: total charge adds up to zero
= 0
- ionic compounds are neutral
Chemical Formula = ______ ·· ··
CaI2 ·· ··