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Unit 3: Chemical Bonding Section 3: Molecular Geometry

Section 3: Molecular Geometry. Multiple Bonds – occur in covalent compounds when atoms share more than one pair of electrons Double Bond – atoms share

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Page 1: Section 3: Molecular Geometry.  Multiple Bonds – occur in covalent compounds when atoms share more than one pair of electrons  Double Bond – atoms share

Unit 3: Chemical Bonding

Section 3: Molecular Geometry

Page 2: Section 3: Molecular Geometry.  Multiple Bonds – occur in covalent compounds when atoms share more than one pair of electrons  Double Bond – atoms share

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

Page 3: Section 3: Molecular Geometry.  Multiple Bonds – occur in covalent compounds when atoms share more than one pair of electrons  Double Bond – atoms share

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

Page 4: Section 3: Molecular Geometry.  Multiple Bonds – occur in covalent compounds when atoms share more than one pair of electrons  Double Bond – atoms share

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

Page 5: Section 3: Molecular Geometry.  Multiple Bonds – occur in covalent compounds when atoms share more than one pair of electrons  Double Bond – atoms share

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…