Lecture 28 - Exceptions to the Octet Rule, Bond Length, and Bond Strength

Lecture 28 - Exceptions to the Octet Rule, Bond Length, and Bond Strength

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Lec-28: Exceptions to the octet rule/ Bond length and bond strength Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 1 Formal Charge number of electrons in lone pairs number 1 §· ¨¸ Formal Charge = of valence + number of electrons in 2 electrons bonding pairs ± ©¹ Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 2
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What is the formal charge on the N atom in nitromethane, CH NO ?
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Lewis Symbols Violations of the octet rule: Molecules which are electron Molecules which are electron deficient - sub-octet systems Molecules which are capable of Molecules which are capable of making more than four covalent bonds Molecules which possess an odd number of electrons Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 3 Molecules with less than an octet Some atoms (for example, Be, B, and Al) undergo bonding, but will form stable molecules that do not fulfill the octet rule. BF 3 0 0 +1 #ve = 24 -1 +1 0 -1 +1 -1 Experiments demonstrate 0 0 0 Experiments demonstrate that the B-F bond strength is consistent with single bonds only. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 4 3-1
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Molecules with less than an octet coordinate covalent bond Sub-octet molecules will react with other molecules such that the octet rule is satisfied.
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Lecture 28 - Exceptions to the Octet Rule, Bond Length, and Bond Strength

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