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Lewis Dot Structures

Lewis Dot Structures. Aka Dot Diagrams Electron Dot Diagrams. Valence electrons are the electrons on the outermost energy level. 6 valence electrons on this atom. Image from Wikipedia. . . . . . 1s. 2s. 2p. Valence electrons.

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Lewis Dot Structures

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  1. Lewis Dot Structures Aka Dot Diagrams Electron Dot Diagrams

  2. Valence electrons are the electrons on the outermost energy level. 6 valence electrons on this atom. Image from Wikipedia

  3.      1s 2s 2p Valence electrons Thefinal s and p valence electrons are especially important because they determine what kinds of reactions an atom will undergo.

  4. If you write the Shorthand Configuration for an element, the s and p electrons on the highest energy level are the valence electrons. Example: Tin, Sn: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p2 valence electrons

  5. Lewis Dot Structures show only the Valence electrons for an element. • A Dot Diagram consists of two parts: • the element symbol • dots that represent the S and P block electrons Dots may only go on the sides of the element symbol Sn

  6. Rules for Writing Lewis Dot Diagrams: • Only use s and p valence electrons • If there are d or f valence electrons in between the s and p sublevels, they are left out of the dot diagram. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p2

  7. Rules for Writing Lewis Dot Diagrams: • You must put 1 electron dot on each side of the element symbol before you put 2 on one side (like Hund’s rule) El El For example: Imaginary Elementium (El) has 3 valence electrons (5s2 and 5p1)

  8. Example: Tin, the last electrons are 5s2 4d10 5p2. For the dot diagram, we will use only the valence electrons 5s2 and 5p2. Therefore we will place 4 dots around the element symbol. Sn = places where electrons can go Don’t draw it, just think it

  9. Example: Bromine Shorthand Configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5. Use only the 4s2 and the 4p5. A total of 7 electron dots. Br

  10. Practice problems • Neon • Sodium • Aluminum

  11. Answers to Practice Ne Na No, it does not matter which side has no electron dots as long as there are the correct number of sides without dots. Al

  12. Assignment • Complete the Dot Diagram Periodic Table Assignment. • Answer all questions. • Be sure to label your Dot Diagram Periodic Table when the instructions say to. • You will turn them in next week (Tuesday)

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