1. Valence Electrons Lewis Dot/Electron Dot Diagrams

2. Atomic Models When drawing Bohr models, electrons belong in _____________ outside the ________ of the atom. energy levels nucleus __ in the first __ in the second __ in the third 2 8 8

3. Valence Electrons The energy level that is ________ from the nucleus is called the ________ shell. farthest valence These electrons will be the ones most likely to ________ with other atoms in chemical _________. interact reactions

4. Valence Electrons If the valence electrons are the only particles that will be involved in reactions, the other particles aren’t as __________. ‘important’ There should be a way to represent just the valence electrons…

5. Electron Dot Diagrams Electron Dot (also called ______ Dot diagrams) show only the _________ electrons in an atom. Lewis valence It includes the ______________ and the _______ of valence electrons. element symbol number Let’s figure out the ‘rules’ for drawing Lewis/Electron Dot Diagrams…

6. Rules for Electron Dot Diagrams 1. The first __ valence electrons go on the _____ side of the element symbol. 2 right HHe

7. Rules, Continued… 2. Electrons are added ____ at a time in a _________ direction. one clockwise X

8. More Rules 3. Pair electrons, starting at the _______. bottom X

9. Want a Hint? The maximum number of valence electrons is ___. 8 Look at the electron configuration on the Periodic Table – under the atomic number… What is the last number in the sequence? Valence electrons!