Electrons and Energy Levels Electrons are found in energy levels Energy LevelCapacity Level #12 Electrons (2 valence) Level #28 Electrons (8 valence) Level #318 Electrons (8 valence) Level #432 Electrons (8 valence) Energy Level Diagram for Fluorine In the first orbit, there are 2 electrons. In the second orbit, there are 7 electrons. In the third orbit, there are no electron Diagrams for Hydrogen and Carbon Valence electronsValence electrons The electrons in the outermost energy level of an atom. The number of valence electrons vary from 1 to 8. These are the electrons that participate in chemical bonding. Know the group know the valence electrons! Use the periodic table to find the number of valence electrons quickly, or for elements that we do not know how to draw... Elements belonging in Group 1 (IA) ( H, Li, Na, K ) 1 valence electron Elements belonging in Group 2 (IIA) ( Be, Mg, Ca ) 2 valence electrons Elements belonging in Group 3 (IIIA) (B, Al, Ga,) 3 valence electrons Know the group know the valence electrons! Elements belonging in Group 4 (IVA) (C, Si) have 4 valence electrons Elements belonging in Group 5 (VA) (eg - N, P) have 5 valence electrons Elements belonging in Group 6 (VIA) (eg - O, S) have 6 valence electrons Elements belonging in Group 7 (VIIA) (eg - F, Cl) have 7 valence electrons Elements belonging in Group 8 (VIIIA) (eg He, Ar) have 8 valence electrons Electron dot diagrams Only show VALENCE electrons Element symbol goes in the middle One dot for each valence electron around the symbol Starting from the top, and moving clockwise, one dot goes around each side (4 sides) When a dot (electron) is around all 4 sides, fill in a second, again starting from the top.