L12-Interactions_of_Atoms

L12-Interactions_of_Atoms - Part II Interactions of Atoms:...

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Part II Interactions of Atoms: Formal Charge, Resonance and VSEPR Formal Charge (FC) the hypothetical charge on an atom in a molecule or polyatomic ion not a real charge due to differences in proton and electron numbers assumes that electrons are shared equally between atoms ignores differences in electronegativity the closer to zero, the better Formal Charge (FC) Assists in writing correct Lewis formulas FC = (group number) - [(number of bonds)+(number of unshared e-)] 1. Calculation of Formal Charge for an atom 2. An atom in a Lewis formula that has the same number of bonds as its periodic group number has a formal charge of zero 3. In a molecule, the sum of the formal charges is zero 4. In an ion, the sum of the formal charges is equal to the real charge Lewis Dot Formulas: Limitations of the Octet Rule/Using Formal Charge Limitation 4 : Covalent compounds or polyatomic ions with an odd number of electrons NO 2 Step 1: What is the reasonable symmetrical skeleton? Step 2: What are N, A and S? Step 3: Where do we place the shared electrons? Step 4: What do we do with the rest of the electrons?
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L12-Interactions_of_Atoms - Part II Interactions of Atoms:...

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