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
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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