Lecture 10 Exceptions to the Octet Rule

Lecture 10 Exceptions to the Octet Rule - Exceptions to the...

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Exceptions to the Octet Rule, Resonance, and the VSEPR Model B. A. Rowland 53750/53760 Exception 1: Octet Deficient Atoms Up to this point, we have only discussed one octet deficient atom—hydrogen. Hydrogen only wants 2 electrons to fill its “octet”. There are 3 other atoms we will be concerned with as being “octet deficient”: Be, B, and Al. Beryllium will only have 4 electrons in a full “octet”, while Boron and Aluminum will require 6. You must memorize these. These will be the only exceptions we will be concerned with when we are computing the number of electrons required to fulfill the octet rule (step 2 in the algorithm). H, Be, B, and Al will, in general, not have lone pairs (though there are cases where they will). When you follow the algorithm, you will generate structures for which the formal charges should sum to the molecular or ionic charge. Practice problems: Draw and assign formal charges to atoms for the molecules: BeO, H 2 , BCl 3 , and AlF 3 . Exception 2:
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Lecture 10 Exceptions to the Octet Rule - Exceptions to the...

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