Quantum Mechanics and Bonding

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Quantum Mechanics and Bonding
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QM to Explain Ionic Bonds

• Transfer of electron from one orbital to another

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QM to Explain Covalent Bonds

• In grade 11 you noticed exceptions to the octet
  rule for molecular compounds
• A more complex understanding than simple Lewis
  structures is required
• Valence Bond Theory

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Valence Bond Theory

• A covalent bond forms when the atomic orbitals of
  2 atoms overlap to share a common region in space
• The region of overlap can contain a maximum of 2
  electrons with opposite spins (Pauli exclusion
  principle)
• The greater the overlap, the stronger the bond.
  Shape of overlap depends on the shape and
  orientation of orbitals involved
• Orbital hybridization occurs when orbitals
  overlap and combine to form new orbitals

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