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Unformatted text preview: e most likely candidate. Remember that the more electronegative atom will generally prefer the
negative formal charge. The formal charge for each atom on the formate ion is shown below. Note how the sum
of the formal charges (0 + 0 + 0 + - 1) adds up to the - 1 charge on the formate ion. Figure 4
The structure shown above is the Lewis structure representation of the formate ion. Note that the structure
could also have been drawn with two bonds directed towards the oxygen on the right. This is known as a
resonance structure. Resonance structures have the same number of electrons, but may have a different number
of shared pairs or the atoms in the structure may have different formal charges. Figure 5
Once a Lewis structure has been drawn, one can evaluate the bond orde r of shared pairs. A shared pair is a
single bond with a bond order of 1; two shared pairs in a bond is a double bond (bond order = 2) and three
shared pairs in a bond is a triple bond (bond order = 3). In general, the bond strength increase...
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This document was uploaded on 01/22/2014.
- Spring '14