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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.

Sections:
00:00 - Introduction to Lewis diagrams
00:13 - Review of Bohr model using nitrogen
01:13 - Valence electrons and reactivity
01:34 - Drawing a Lewis diagram for nitrogen
02:07 - Lewis diagram for nitride ion
02:45 - Understanding periodic table group patterns
03:41 - Valence electrons and periodic table groups
04:03 - Shortcut for Groups 13–18 valence electrons

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