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In a Lewis structure, the nucleus is represented by the atomic symbol with a line between the atoms in a bond
depicting each pair of shared bonding electrons in the structure. Non- bonding electrons around the atoms are
depicted as dots. The steps to building a Lewis structure representation of a molecule are shown below. The
Lewis structure of the formate ion, CHO2-, will be used as an example.
Calculate the e le ctrons re quire d (ER) = the minimum number of electrons necessary to satisfy the octet rule for
the non- hydrogen atoms and the duet rule for hydrogen. For CHO2-, this would be (2 electrons × 1 hydrogen
www.webassig n.net/ebooks/wsug encheml1/lab_6/manual.html 1/8 4/15/13 Lab 6 - M olecular Geometr y atom) + (8 electrons × 3 non- hydrogen atoms) = 2 + 24 = 26 electrons required.
Calculate the number of available vale nce e le ctrons (VE) = the total number of electrons available for the
molecule. For example, in CHO2-, this would be (1 C atom × 4 electrons) + (1 H atom × 1 electron) + (2 O
atoms × 6 electrons) + (1 electron as the ion has a charge of - 1) = 4 + 1 + 12 + 1 = 18...
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This document was uploaded on 01/22/2014.
- Spring '14