Page 121 - Chemistry eBook

Lewis Dot Diagram for Polar Covalent Bond
Here’s a quick review:
1. Write the symbols of the elements next to each other. (If there are more
than two elements, place the element with the most electrons in the
center and the other elements around it—see example below.) 2. The shared electrons should be drawn as a line between the two
symbols. Each line represents two electrons. The unshared electrons should be drawn using a symbol.)
Draw a Lewis dot diagram of NH3.
We already learned how to write a Lewis dot diagram for covalent bonds. Let’s just give an example.
1. N has five valence electrons. H has one valence electron. Therefore, we place the N in the center and three H’s around it. (H3 means there are three H’s.)
2. Draw a line between the elements sharing the electrons. (Each line represents two electrons.)
3. Draw the element symbol for the remaining two electrons.
UNIT 4: BONDING © 121