CH 7-8-9 - notes 7-formal charge resonance strength

CH 7-8-9 - notes 7-formal charge resonance strength - AP...

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AP chem – O’Malley Chapters 7, 8, 9 – structure & bonding 7 Name: ____________________ Text: p 362 – 367 (8.12) FORMAL CHARGE not an actual charge, but a way to track electron density in a molecule. 1. The formal charge of an atom is its valence electrons minus its ____________ and ____________ electrons. 2. Formal charges show how electron-__________ or electron-___________ a certain atom is in a structure. 3. Nature hates charges… so atoms try to achieve a formal charge close to _____________! 4. Wherever possible, negative charges will reside on the more __________________ atom. 8.81 – Draw a structure for each of the following and assign any non-zero formal charges. a. POCl 3 b. SO 4 2- c. PO 4 3- d. XeO 4 RESONANCE when one Lewis structure just isn’t enough! 1. Electrons are not always __________________ on an atom or between a pair of atoms. 2. It is possible for electrons to be ______________________ and shared between more than two atoms. 3. Lewis structures which differ only in the placement of electrons are __________________ strucutres. Draw all resonance structures for each of the following: a. nitrate (four possibilities) b. ozone (two resonance forms) c.
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CH 7-8-9 - notes 7-formal charge resonance strength - AP...

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