AP Chemistry / Unit 2: Compound Structure and Properties
2.5 Lewis Diagrams
Notes
Lewis diagrams show valence electrons as bonds and lone pairs.
- Count total valence electrons, connect atoms, complete octets (H gets 2), use multiple bonds if needed.
Practice
Total valence electrons in $\mathrm{CO_2}$:
$4+2(6)$.
The Lewis structure of $\mathrm{N_2}$ has:
Each N completes its octet.
How many lone pairs on the O in water?
8 electrons: 2 bonds, 2 lone pairs.
Ready for more? Take the Unit 2 test.