CHEM 150 1nd Edition Chapter 8: Chemical Bonding and Climate Change Lecture 28Outline of Last Lecture • Formal charge: • Total the electrons around the atom (bonding electrons are split evenly between the bound atoms). • Subtract this from the atoms normal compliment of valence electrons.• Formal charge can help us decide between different possible structures. The best structure minimizes the formal charges. (Ideally, all formal charges will be zero.)Outline of Current Lecture • Exceptions to the octet rule:• Li, Be, and B sometimes form compounds in which they have fewer than eight valence electrons.Current LectureQ: Draw Lewis structure BF3BeCl2Any atom in the third period or lower can have more than eight valence electrons. PCl5SF6HClO3CINOCIO2-MnO4-XeF2-Odd numbers of electrons NO
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