Lecture8PartII

Lecture8PartII - Chapter 8 Part II Exceptions to the octet...

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Chapter 8 Part II
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Exceptions to the octet rule Boron tends to form compounds in which the boron atom has fewer than eight electrons around it (it does not have a complete octet). BH 3 = 6e B H H H
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Exceptions to the octet rule Elements from period 3 and above can exceed the octet rule WHY??? These atoms have available D orbitals that can hold the extra electrons Place the extra electrons on the central atom SF 6 XeF 4 PCl 5 12 electrons 12 electrons 10 electrons
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Let’s Review C, N, O, and F should always be assumed to obey the octet rule. B and Be often have fewer than 8 electrons around them in their compounds. Second-row elements never exceed the octet rule. •3 rd row and heavier elements often satisfy the octet rule but can exceed the octet rule by using their empty valence d orbitals. When writing the Lewis structure for a molecule, satisfy the octet rule for the atoms first . If electrons remain after the octet rule has been satisfied, then place them on the elements having available d orbitals (elements in Period 3 or beyond).
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Example Draw a Lewis structure for each of the following molecules: BF 3 PCl 5 SF 6
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Lewis Structures Octet Rule for all atoms except Hydrogen
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This note was uploaded on 09/20/2010 for the course CHEM 102 taught by Professor Peterpastos during the Summer '08 term at CUNY Hunter.

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Lecture8PartII - Chapter 8 Part II Exceptions to the octet...

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