drawlewis - Drawing Lewis Structures In the study of...

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Drawing Lewis Structures In the study of covalent compounds, drawing what is known as a Lewis Structure is a method often used to help to understand the bonding within a molecule of the compound. Once a “good” Lewis Structure has been drawn, a number of important things about the molecule can be deduced from this structure. For example, the nature of the individual bonds between atoms can be determined as well as the three-dimensional shape of the molecule. Although Lewis Structures are not exactly "pictures” of how the molecules might look if you could see them, they are very useful in chemistry. Drawing a “good” Lewis Structure is not usually difficult and one only has to follow a few simple rules to accomplish the task. I have summarized the steps in the process below. Step 1 Before you can draw a Lewis Structure, you must know how the individual atoms are attached to each other. If you do not know or cannot guess which atoms are attached to which other atoms, you cannot draw the structure. Fortunately, it is often easy to guess the connectivity of the atoms of a compound. If that is not possible, you will be told how the atoms are connected. For example, in the compound formaldehyde (CH 2 O), the carbon atom is attached to 2 different hydrogen atoms and to the oxygen atom as shown below. H bonded to C C O H H O bonded to C Step 2 Once the connectivity is known, you must determine the total number of electrons in the valence shells of all of the atoms of the molecule. This is done simply by multiplying the
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drawlewis - Drawing Lewis Structures In the study of...

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