1. Bonds Ionic or Covalent?

2. Warm-up Lewis Dot Diagrams
PCl3
P= ___valence electrons
CL=___valence electrons
NH3
Write your own instructions on how to complete Lewis Dot Diagrams
Hint:
Step 1: Find out the valence electrons for each element
...

3. Gilbert Newton Lewis (surrounded by pairs of electrons)
Ionic bonding,
Lewis Dot Diagrams
Gilbert Newton Lewis (surrounded by pairs of electrons)

4. Overview: Types of Bonds
There are 2 bond types : ionic and covalent
In ionic bonding one atom has a stronger attraction for electrons than the other, and “steals” an electron from a second atom
In covalent bonding the attraction for electrons is similar for two atoms. They share their electrons to obtain an octet.
MgO
(ionic),
CaCl2
(ionic),
SO2
(covalent),
PbCl2
(ionic),
CCl4
(covalent),
CH4
(covalent)

5. When is the bond Ionic? Metal and non-metal (alkali & Halogens)
Electronegativity Difference
The rule is that when the electronegativity difference is greater than 1.7, the bond is ionic.

7. BF (Hard)
CFl3 (Harder)
CH2F2 (Hardest)
CH3COOH (Challenge)

8. Step 1 find out valence electrons for each one.
Draw diagram
Connect the dots
Write the answer without the electron dots
Use last class notes if necessary