Lecture Notes 9

In these instances the true structure can only be

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Unformatted text preview: pair contribute equal numbers of electrons to the covalent bond, but sometimes both electrons in a bond pair are derived from a single atom (coordinate covalent bond). 6. Sometimes, it is necessary to represent double or triple covalent bonds in a Lewis structure (C, N, O, P, S). 7. Sometimes, it is impossible to draw a single Lewis structure that is consistent with all the available data. In these instances the true structure can only be represented as a composite or hybrid of two or more plausible structures. This situation is called resonance. GChem I 9.8 Steps 1. Determine the number of available valence electrons, A . Add up the total number of valence electrons for all the atoms in the structure. For anions, add the charge of the ion. For cations, subtract the charge of the ion. This is the number of electrons that must appear in the Lewis structure. 2. Determine the number of valence electrons needed for octets, N . This number N equals the number of non-H atoms times eight plus the number...
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