Exceptions to the Octet Rule

Exceptions to the Octet Rule - Exceptions to the Octet Rule...

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Exceptions to the Octet Rule There are three general ways in which the octet rule breaks down: 1. Molecules with an odd number of electrons 2. Molecules in which an atom has less than an octet 3. Molecules in which an atom has more than an octet Odd number of electrons Draw the Lewis structure for the molecule nitrous oxide (NO): 1. Total electrons: 6+5= 11 2. Bonding structure: 3. Octet on "outer" element: 4. Remainder of electrons (11-8 = 3) on "central" atom: 5. There are currently 5 valence electrons around the nitrogen. A double bond would place 7 around the nitrogen, and a triple bond would place 9 around the nitrogen. We appear unable to get an octet around each atom Less than an octet (most often encountered with elements of Boron and Beryllium ) Draw the Lewis structure for boron trifluoride (BF 3 ): 1. Add electrons (3*7) + 3 = 24 2. Draw connectivities: 3. Add octets to outer atoms:
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4. Add extra electrons (24-24=0) to central atom: 5. Does central electron have octet? NO. It has 6 electrons
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Exceptions to the Octet Rule - Exceptions to the Octet Rule...

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