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# How is the Lewis structure of an ion written?

Last updated date: 12th Aug 2024
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Hint: To draw the Lewis structure of any molecule or ion, the valence electrons are determined first. While counting the electrons of the compounds carrying charges, the negative ion should contain extra electrons in their Lewis structure and the positive ions should have fewer electrons as compared to the uncharged molecule.

Example: In ammonium ion $NH_4^ +$, the total valence electrons by one nitrogen atom and four hydrogen atoms is 9. As positive charge is present so the valence electrons are subtracted by 1. Therefore, the total valence electron of the ammonium ion will be (9 – 1 =8).
In hypochlorite ion $Cl{O^ - }$, the total valence electrons by one chlorine and one oxygen atom is 13 as negative charge is present so 1 is added. Therefore, the total valence electrons of hypochlorite ions is $13 + 1 = 14$.