Ch 13: Covalent Bonding
Section 13: ValenceShell ElectronPair Repulsion
1.
Recall the rules for drawing Lewis dot structures
2.
Remember the special situations:

Resonance structures

Formal charges

Suboctets and expanded octets
3.
Use the best LDS to determine the electron pair
geometry and molecular shape of the molecule/ion
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LDS Mechanics
Three steps for “basic” Lewis structures:
1.
Sum the valence electrons for all atoms to
determine total number of electrons (add e for
any net negative charge or remove e for any net
positive charge)
2.
Use pairs of electrons to form a bond between
each pair of atoms (bonding pairs).
3.
Arrange remaining electrons around atoms (lone
pairs or multiple bonds) to satisfy the “octet rule”
for each atom (“duet” rule for hydrogen).
Remember