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Unformatted text preview: Chapter 7 Directions for Lewis Dot and Polarity Lewis Dot Instructions NOTICE: To successfully complete a drawing, you must follow each step in order. Step 1 Count the valence electrons ( outer energy level electrons)- the Roman numeral at the top of the group on the periodic table represents the valence electrons. Using H 2 O as an example it would be 8 ( 6 for O and 1 for each H) Step 2 Hook all atoms to central atom with single bonds. Use a line ( - ) to represent the bond. Remember that the line is actually two dots. Again using water as an example: H- O - H. The line between the H and O counts as two electrons for the H and two electrons for the O. If there are more than four atoms around the central atom, such as SF 6 , still hook all atoms to the central atom. In the case of SF 6 it would have 6 fluorine atoms hooked to the S. Step 3 Put eight dots around all atoms except H. (B usually has only six electrons around it). Again using water as an example, put two dots above the O and two dots below the O. With the two (-), that makes 8 electrons around the O and two around both H's.( Consider the central atom to be the onethe O and two around both H's....
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