1. How to Draw Lewis Dot Structures & Bonding

2. Lewis Structures 1)Find your element on the periodic table. 2)Determine the number of valence electrons. 3)This is how many electrons you will draw.

3. Lewis Structures Find out which group (column) your element is in This will tell you the number of valence electrons your element has. You will only draw the valence electrons. www.chem4kids.com

4. Groups - Review Each element in a group has the same number of electrons in their outer “shells”. Except for He, it has 2 electrons The electrons in the outer shell are called “valence electrons” www.chem4kids.com

5. Groups - Review Each element in a group has the same number of electrons in their outer “shells”. Except for He, it has 2 electrons The electrons in the outer shell are called “valence electrons” www.chem4kids.com Groups 13-18: Valence e- = Group# - 10 So Oxygen  16 – 10 = 6ve-

6. Lewis Structures 1)Write the element symbol. 2)Phosphorus ; 15 th group, 15-10 = 5 valence electrons 3)Starting at the right, draw 5 electrons, or dots, counter- clockwise around the element symbol 4)After 4 electrons, begin to pair up electrons

7. Lewis Structures 1)Check your work. 2)Using your periodic table, check that Phosphorus is in the 15 th group. 3)You should have 5 total electrons, or dots, drawn in for Phosphorus.

8. Lewis Structures On your worksheet, try these elements on your own: a)H b)C c)Ca d)Ar e)Cl

9. Lewis Structures On your board, try these elements on your own: a)H

10. Lewis Structures On your worksheet, try these elements on your own: a)H b)C

11. Lewis Structures On your worksheet, try these elements on your own: a)H b)C c)Ca

12. Lewis Structures On your worksheet, try these elements on your own: a)H b)C c)Ca d)Ar

13. Lewis Structures On your worksheet, try these elements on your own: a)H b)C c)Ca d)Ar e)Cl

14. Lewis Structures On your worksheet, try these elements on your own: a)H b)C c)Ca d)Ar e)Cl f)Al

15. Paired/ Unpaired Electrons Electrons like to be in pairs Atoms like to have full valence shells (8) 1 Electron in 1 st shell 7 Electrons in 3 rd shell

16. Paired/ Unpaired Electrons Electrons like to be in pairs Atoms like to have full valence shells (8) 2 Electrons in 1 st shell FULL!!

17. Paired/ Unpaired Electrons Electrons like to be in pairs Atoms like to have full valence shells (8) FULL!! 8 Electrons in 3 st shell

18. Paired/ Unpaired Electrons Electrons like to be in pairs Atoms like to have full valence shells (8) Shared electrons create bonds between atoms

19. Paired/ Unpaired Electrons Electrons like to be in pairs Atoms like to have full valence shells (8) Shared electrons create bonds between atoms

20. Paired/ Unpaired Electrons Some bonding gets complicated

21. Paired/ Unpaired Electrons Some bonding gets complicated

22. Paired/ Unpaired Electrons Some bonding gets complicated

23. Paired/ Unpaired Electrons Some bonding gets complicated

24. Paired/ Unpaired Electrons Some bonding gets complicated

25. Paired/ Unpaired Electrons Some bonding gets complicated

26. Project For Friday!!! Electron Dot Diagrams Atom Name (bottom of square) Atomic Symbol (Middle of square) Dot Diagram (Include ALL Electrons) Atomic Number (Top right corner) Number of electrons in each shell (Top left corner)

27. Project For Friday!!! Helium 2 1.) 2 electrons