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Unformatted text preview: The 3 rd row and heavier elements often satisfy the octet rule but can exceed the octet rule by using empty valence d orbitals. When writing the Lewis structure for a molecule, satisfy the duet or octet rule first. If electrons remain after the octet rule has been satisfied, then place them on the elements having available d orbitals. See sample exercise 8.7: PCl5-total # of valence e- = 5 + 5 x 7 = 40e P: 5e-Cl: 7e-:Cl: :Cl: P :Cl: : Cl: :Cl: 8.12 Resonance NO3-: a controversy between theory and experiment-Draw Lewis structure of NO3--Experiment: all N- O bonds are identical! NO3-: 5e- + 3 x 6e + 1e- = 24e-4 x 8e-: 32e-32e- - 24e- = 8e-8e-/ 2 =4 bonding pairs :O: :O: N :O:-Resonance Structures-Odd Electron Molecules-Formal Charges-Using Formal Charges to Evaluate Lewis Structures...
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- Fall '10