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For an anion, you would add the negative charge to the number of electrons in order to figure out the total number of electrons to draw in the Lewis structure. Moreover, you can then draw brackets around the whole Lewis structure and write the negative charge outside the top right corner of the brackets.
An anion is indicated in a Lewis structure by drawing brackets around the molecule with the overall charge written out next to it. When determining how to draw this Lewis structure, you sum the valence electrons of all atoms in the molecule. Then, you add the number of electrons indicated by the charge of the anion to the previous sum.
First, add the negative charge to the total number of electrons in order to know how many electrons to represent in the Lewis structure. Second, you can draw brackets around the Lewis structure and write the negative charge besides the top right corner.
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