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Lewis Structures = Dot Diagrams. We can show how the atoms share or transfer electrons by drawing electron dot diagrams. You will only use the valence e- for dot diagrams. Dot Diagrams. Start the dot diagram by writing the atomic symbol for the atom. Ex: Mg The symbol has 4 sides….

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lewis structures dot diagrams
Lewis Structures = Dot Diagrams
  • We can show how the atoms share or transfer electrons by drawing electron dot diagrams.
  • You will only use the valence e- for dot diagrams.
dot diagrams
Dot Diagrams
  • Start the dot diagram by writing the atomic symbol for the atom.

Ex: Mg

The symbol has 4 sides…

dot diagrams1
Dot Diagrams

2

Mg

Each side can hold up to 2e- for a maximum of 8e-.

You cannot pair the electrons until there is one on each side.

1

3

4

dot diagrams2
Dot Diagrams

2

Mg

Mg only has 2 valence e-.

So its dot diagram looks like this:

Mg

1

3

4

dot diagrams3
Dot Diagrams
  • Lets Practice!!! Draw the Dot Diagrams for:

1.) Cl 4.) C

2.) Al 5.) Ne

3.) Na

dot diagrams4
Dot Diagrams
  • How did you do???

1. Cl 4.) C

2.) Al 5.) Ne

3.) Na

dot diagrams5
Dot Diagrams

Now we can put individual diagrams together to show whether atoms transfer (ionic bonds) or share (covalent bonds) their valence e-!!!

bonding dot diagram steps
Bonding Dot Diagram Steps

1.) Identify the type of bond you have. (Covalent or Ionic)

2.) Separate the individual elements and put them in a line or box formation. Put the atomic symbol w/ least amount of valence e- in CENTER!!! (Remember H’s have to be on ENDS!!!)

3.) Draw the “dots” for each atomic symbol.

4.) Locate all of the “lonely e-”. Show either the transferring or sharing of e- with arrows or bars. (If sharing…connect the “lonely” dots between DIFFERENT symbols!!!)

5.) For COVALENT: Count the e- around each atomic symbol to make sure there are 8!!! (ONLY 2 for H!!!)

dot diagrams for ionic bonds
Dot Diagrams for Ionic Bonds

We know that in an Ionic Bond (metal +nonmetal) atoms are transferring their valence e- …

We can show this w/ dot diagrams.

For Ex: (Li + Cl = LiCl)

Li Cl

dot diagrams for covalent bonds
Dot Diagrams for Covalent Bonds

We know that in a Covalent Bond (nonmetal + nonmetals) atoms are sharing their valence e- …

We use a BAR written between the Atomic Symbols to represent the sharing of e-.

One bar = 2 e-

For Ex: H2O

dot diagrams for covalent bonds1
Dot Diagrams for Covalent Bonds

One bar = 2 e-.

For Ex: H2O

H O H

***H’s ALWAYS have to go on the ENDS.

dot diagram practice
Dot Diagram Practice

1.) CaCl2

2.) SiO2

3.) NH3

4.) Na3N