Lewis Structures - University of Louisville Writing Lewis...

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University of Louisville Chem 201-03 Dr. Hoyt Fall 2007 Writing Lewis structures Notes A. Remember that H only takes two electrons (one bond). The "octet" for H is satisfied by two electrons. NEVER put more than one bond on H ! For this reason H never goes in the center of a molecule (it’s always terminal). B. If your compound has an odd total number of electrons, proceed through Step 4 until only one single electron is left. Then, add that odd electron to the atom which would next receive a lone pair. This atom will end with seven electrons instead of octet in Steps 5 and 6. C. Row 2 atoms will NEVER have more than 8 electrons and will NEVER make more than 4 bonds. Steps 1. Arrange the atoms according to how they will be connected, and attach with single bonds (that is, draw the skeletal structure). Sometimes this will be clear from the formula, sometimes not. Usually the (non-H) atom with either (a) the fewest valence electrons or (b) the lowest electronegativity goes in the center.
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