https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:ionic-bonds/v/valence-electrons-and-ionic-compounds 2022-09-07T08:21:01.673602243Z Valence electrons and ionic compounds When forming ions, elements typically gain or lose the minimum number of electrons necessary to achieve a full octet. For example, fluorine has seven valence electrons, so it is most likely to gain one electron to form an ion with a 1- charge. We can use this method to predict the charges of ions in ionic compounds. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/0fa65651-5c25-4356-ab62-0ddbdaf7cdb5_1280_720_base.png Valence electrons and ionic compounds When forming ions, elements typically gain or lose the minimum number of electrons necessary to achieve a full octet. For example, fluorine has seven valence electrons, so it is most likely to gain one electron to form an ion with a 1- charge. We can use this method to predict the charges of ions in ionic compounds. https://cdn.kastatic.org/ka-youtube-converted/XPnlIEk7XrU.mp4/XPnlIEk7XrU.mp4 475 The octet rule https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:lewis-diagrams/v/lewis-diagrams 2024-06-26T17:43:47.400140177Z Lewis diagrams for atoms and ions Lewis diagrams for atoms and ions are models that show the number of valence electrons (outermost electrons) they have. Lewis diagrams of atoms show the element's symbol surrounded by dots representing valence electrons. For monatomic ions, Lewis diagrams also includes brackets and the ion's charge. The number of valence electrons in an ion's Lewis diagram reflects the ion's charge. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/818b3dc3-ce2b-4bdd-b76c-1d2c47e929f4_1280_720_base.png Lewis diagrams for atoms and ions Lewis diagrams for atoms and ions are models that show the number of valence electrons (outermost electrons) they have. Lewis diagrams of atoms show the element's symbol surrounded by dots representing valence electrons. For monatomic ions, Lewis diagrams also includes brackets and the ion's charge. The number of valence electrons in an ion's Lewis diagram reflects the ion's charge. https://cdn.kastatic.org/ka-youtube-converted/FuVAgrLqsXs.mp4/FuVAgrLqsXs.mp4 258 The octet rule https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:lewis-diagrams/a/lewis-diagrams-and-the-octet-rule 2026-05-11T04:50:44.398893925Z Learn and try: Lewis diagrams and the octet rule Learn how to draw Lewis diagrams and how they help visualize patterns in electron structure and chemical reactivity. article https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:lewis-diagrams/e/apply-lewis-diagrams-of-atoms 2026-06-30T16:30:41.535282189Z Apply: Lewis diagrams of atoms Apply your understanding of Lewis diagrams of atoms in this set of free, standards-aligned practice questions. Megan Cohn exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:ionic-bonds/e/apply-predicting-ion-formation 2026-06-30T16:30:41.535282189Z Apply: Predicting ion formation Apply your understanding of trends in ion formation in this set of free, standards-aligned practice questions. Emily Cizmas exercise