1. Lewis Electron Dot Diagrams

2. Valence Electrons Electrons found in the outermost energy level of an atom Usually involved in chemical changes Lewis Electron Dot Structures – Symbol represents the nucleus – Dots represent the outer electronss

3. Electron Configurations of First 18 Elements:

4. Electron Dot Diagrams H Li Na K Be Mg Ca B Al Ga C Si Ge N P As O S Se F Cl Br Ne Ar Kr He Group 1A 2A 3A 4A 5A 6A 7A 8A = valence electron s1s1 s2s2 s2p2s2p2 s2p3s2p3 s2p4s2p4 s2p5s2p5 s2p6s2p6 s2p1s2p1 1 2 13 14 15 16 17 18