N 1s 2 2s 2 2p 3

1. 1A 8A H 2A 3A 4A 5A 6A 7A He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Ga Ge As Se Br Kr C Rb Sr In Sn Sb Te I Xe Cs Ba Tl Pb Bi Po At Rn Fr Ra Electron Dot Symbols N 1s2 2s22p3 Sn 1s22s22p63s23p14s23d104p65s24d105p2 Miami Killian Sr. High

2. Electron Dot Symbols also called Lewis Symbols uses dots to represent the valence (outer) electrons in an atom.

3. For example, a model of a carbon atom…. 1s2 2s22p2 …shows that it has 2 electrons in the first energy level and 4 electrons in the outer energy level.

4. C In Electron Dot Symbols, only the electrons in the outer energy level are shown. These are called valence electrons. So the Lewis symbol for carbon is: Even though carbon has 6 electrons, only 4 are in the outer shell.

5. H H O C H H We’ll be using electron dot symbols to show how atoms bond to form compounds like…. To be able to draw electron dot symbols, remember the different energy levels and sublevels the electrons occupy….

6. 1 2 3 4 5 6 7 S sublevel

7. 1 2 3 4 5 6 7 p sublevel

8. 1 2 3 4 5 6 7 dsublevel

9. 1 2 3 4 5 6 7 Sc aZn

10. He 1 2 3 4 5 6 7 He 1s2 H 1s1

11. 1 2 3 4 5 6 7 Li 1s2 2s1 B 1s2 2s22p1 N 1s2 2s22p3 F 1s2 2s22p5 C 1s2 2s22p2 Ne 2s22p6 Be 1s2 2s2 O 1s2 2s22p4

12. 1 2 3 4 5 6 7 Al 1s22s22p63s23p1 Si 1s22s22p63s23p2 Ar 1s22s22p63s23p6 Na 1s22s22p63s1 P 1s22s22p63s23p3 Cl 1s22s22p63s23p5 Mg 1s22s22p63s2 S 1s22s22p63s23p4

13. 1 2 3 4 5 6 7 K 1s22s22p63s23p64s1 Ca 1s22s22p63s23p64s2 Sc aZn

14. H Sc 1s22s22p63s23p64s23d1 Ti 1s22s22p63s23p64s23d2 V 1s22s22p63s23p64s23d3 Cr 1s22s22p63s23p64s23d4

15. 1 2 3 4 X 5 6 7 Ga 1s22s22p63s23p14s23d104p1 Ge 1s22s22p63s23p14s23d104p2 As 1s22s22p63s23p14s23d104p3 Se 1s22s22p63s23p14s23d104p4 Br 1s22s22p63s23p14s23d104p5

16. 1 2 3 4 X 5 6 7 Rb 1s22s22p63s23p14s23d104p65s1 Sr 1s22s22p63s23p14s23d104p65s2 Y 1s22s22p63s23p14s23d104p65s24d1-10 Y

17. 1 2 3 4 X 5 6 7 In 1s22s22p63s23p14s23d104p65s24d105p1 Y

18. 1 2 3 4 X 5 6 7 Y

19. 1 2 3 4 X 5 6 7 1A Group 1A elements have 1 valence electron 2A Group 2A elements have 2 valence electrons Y

20. Group B elements have 2 valence electrons 1 2 3 B 4 X 5 6 7 1A 8A 2A 3A 4A 5A 6A 7A Y