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For covalent bonds, the atoms share the electrons so there is a line drawn between them which shows that they are sharing the electrons. For ionic bonds, one atom completely loses the electrons while the other atom gains it. Therefore, for ionically bonded atoms, you do not draw any line connecting them and you add in their charge in the top right for each atom. To separate them, put a bracket around one of the atomic symbols and its electrons.
Lewis structures are drawn for both covalent and ionic bonds. Ionic structures would have the electrons and brackets of each ion with its charge. Covalent structures can be drawn with lines connecting each other as they share their electrons.
We draw lewis structures for covalent bonds with the line to signify that they share their electrons; ionic bonds would be written with a bracket and their charge. An example of a lewis structure with an ionic bond is ammonium sulfate (NH4)2SO4 which Dr. Lavelle drew as an example last week.
Yes, and I agree with what has already been said. Just wanted to add that I find drawing the lewis dot structures helps tremendously with understanding the exact exchange/sharing of electrons that is occurring with each bond!
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