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In this video, we explain how to calculate the formal charges carried by each atom in a molecule or polyatomic ion. We also see the usefulness of these formal charges: the most probable structure of a molecule is the one that minimizes these formal charges. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning interface that allow learners to study at their own pace, at school or at home. We cover math, science, computer science, economics, and more. Our math lessons take students from preschool to calculus, using cutting-edge, adaptive technology that identifies each student’s learning gaps and strengths. Free. For everyone. Forever. #YouCanLearnEverything Subscribe to the Khan Academy French channel: / @khanacademyfrancais Find thousands of other 100% free videos and interactive exercises on http://fr.khanacademy.org Video under CC-BY-SA license.