Unit 3: Chemical Bonding

Section 3: Molecular Geometry

Multiple Bonds

Multiple Bonds – occur in covalent compounds when atoms share more than one pair of electrons Double Bond –

atoms share 2 pairs of electrons

Triple Bond – atoms share 3 pairs of electrons

Bond Strength vs. Bond Length

The more bonds between 2 atoms, the stronger the bond

The more bonds between 2 atoms, the shorter the length of the bonds

Bond Strength

Single Bond < Double Bond < Triple

Bond

Bond Length

Single Bond > Double Bond > Triple

Bond

VSEPR Theory – “Valence-Shell Electron-Pair Repulsion”

States that repulsion between valence electrons causes electron pairs/bonds to be placed as far apart as possible. Electrons have the same charge, which causes them to repel each other

VSEPR Theory (Continued)

Electrons repelling leads to unique angles between atoms in the molecule.▪ Bond Angle – angle made between

two adjacent atoms in a moleculeBending of molecules leads to specific molecular shapes…